Calculus Examples

$x {(x - 3)}^{2} (x + 1)$

Step 1

Find the first derivative of the function.

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Step 1.1

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$\frac{d}{d x} [x ((x - 3) (x - 3)) (x + 1)]$

Step 1.2

Expand $(x - 3) (x - 3)$ using the FOIL Method.

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Step 1.2.1

Apply the distributive property.

$\frac{d}{d x} [x (x (x - 3) - 3 (x - 3)) (x + 1)]$

Step 1.2.2

Apply the distributive property.

$\frac{d}{d x} [x (x \cdot x + x \cdot - 3 - 3 (x - 3)) (x + 1)]$

Step 1.2.3

Apply the distributive property.

$\frac{d}{d x} [x (x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3) (x + 1)]$

Step 1.3

Simplify and combine like terms.

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Step 1.3.1

Simplify each term.

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Step 1.3.1.1

Multiply $x$ by $x$ .

$\frac{d}{d x} [x (x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3) (x + 1)]$

Step 1.3.1.2

Move $- 3$ to the left of $x$ .

$\frac{d}{d x} [x (x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3) (x + 1)]$

Step 1.3.1.3

Multiply $- 3$ by $- 3$ .

$\frac{d}{d x} [x (x^{2} - 3 x - 3 x + 9) (x + 1)]$

Step 1.3.2

Subtract $3 x$ from $- 3 x$ .

$\frac{d}{d x} [x (x^{2} - 6 x + 9) (x + 1)]$

Step 1.4

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x (x^{2} - 6 x + 9)$ and $g (x) = x + 1$ .

$x (x^{2} - 6 x + 9) \frac{d}{d x} [x + 1] + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.5

Differentiate.

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Step 1.5.1

By the Sum Rule, the derivative of $x + 1$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [1]$ .

$x (x^{2} - 6 x + 9) (\frac{d}{d x} [x] + \frac{d}{d x} [1]) + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.5.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$x (x^{2} - 6 x + 9) (1 + \frac{d}{d x} [1]) + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.5.3

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$x (x^{2} - 6 x + 9) (1 + 0) + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.5.4

Simplify the expression.

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Step 1.5.4.1

Add $1$ and $0$ .

$x (x^{2} - 6 x + 9) \cdot 1 + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.5.4.2

Multiply $x$ by $1$ .

$x (x^{2} - 6 x + 9) + (x + 1) \frac{d}{d x} [x (x^{2} - 6 x + 9)]$

Step 1.6

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x$ and $g (x) = x^{2} - 6 x + 9$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x \frac{d}{d x} [x^{2} - 6 x + 9] + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7

Differentiate.

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Step 1.7.1

By the Sum Rule, the derivative of $x^{2} - 6 x + 9$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [9]$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [9]) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [9]) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.3

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x$ with respect to $x$ is $- 6 \frac{d}{d x} [x]$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 \frac{d}{d x} [x] + \frac{d}{d x} [9]) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.4

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 \cdot 1 + \frac{d}{d x} [9]) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.5

Multiply $- 6$ by $1$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 + \frac{d}{d x} [9]) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.6

Since $9$ is constant with respect to $x$ , the derivative of $9$ with respect to $x$ is $0$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 + 0) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.7

Add $2 x - 6$ and $0$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + (x^{2} - 6 x + 9) \frac{d}{d x} [x])$

Step 1.7.8

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + (x^{2} - 6 x + 9) \cdot 1)$

Step 1.7.9

Multiply $x^{2} - 6 x + 9$ by $1$ .

$x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + x^{2} - 6 x + 9)$

Step 1.8

Simplify.

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Step 1.8.1

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x - 6) + x^{2} - 6 x + 9)$

Step 1.8.2

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x) + x \cdot - 6 + x^{2} - 6 x + 9)$

Step 1.8.3

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x)) + (x + 1) (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 1.8.4

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + (x + 1) (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 1.8.5

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 1.8.6

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 1.8.7

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + (x + 1) \cdot 9$

Step 1.8.8

Apply the distributive property.

$x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9

Combine terms.

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Step 1.8.9.1

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 1.8.9.1.1

Multiply $x$ by $x^{2}$ .

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Step 1.8.9.1.1.1

Raise $x$ to the power of $1$ .

$x^{1} x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.1.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{1 + 2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.1.2

Add $1$ and $2$ .

$x^{3} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.2

Raise $x$ to the power of $1$ .

$x^{3} - 6 (x^{1} x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.3

Raise $x$ to the power of $1$ .

$x^{3} - 6 (x^{1} x^{1}) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{1 + 1} + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.5

Add $1$ and $1$ .

$x^{3} - 6 x^{2} + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.6

Move $9$ to the left of $x$ .

$x^{3} - 6 x^{2} + 9 \cdot x + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.7

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + x (2 (x^{1} x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.8

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + x (2 (x^{1} x^{1})) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.9

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + x (2 x^{1 + 1}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.10

Add $1$ and $1$ .

$x^{3} - 6 x^{2} + 9 x + x (2 x^{2}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.11

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 (x^{1} x^{2}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.12

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + 2 x^{1 + 2} + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.13

Add $1$ and $2$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.14

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 (x^{1} x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.15

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 (x^{1} x^{1})) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.16

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 x^{1 + 1}) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.17

Add $1$ and $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 x^{2}) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.18

Multiply $2$ by $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.19

Move $- 6$ to the left of $x$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} + x (- 6 \cdot x) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.20

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 (x^{1} x) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.21

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 (x^{1} x^{1}) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.22

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{1 + 1} + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.23

Add $1$ and $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.24

Move $- 6$ to the left of $x$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} + 1 (- 6 \cdot x) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.25

Multiply $- 6$ by $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} - 6 x + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.26

Subtract $6 x^{2}$ from $2 x^{2}$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.27

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 1.8.9.27.1

Multiply $x$ by $x^{2}$ .

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Step 1.8.9.27.1.1

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{1} x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.27.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{1 + 2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.27.2

Add $1$ and $2$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{3} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.28

Multiply $x^{2}$ by $1$ .

$x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{3} + x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.29

Add $2 x^{3}$ and $x^{3}$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 4 x^{2} - 6 x + x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.30

Add $- 4 x^{2}$ and $x^{2}$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.31

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 (x^{1} x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.32

Raise $x$ to the power of $1$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 (x^{1} x^{1}) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.33

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{1 + 1} + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.34

Add $1$ and $1$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{2} + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.35

Multiply $- 6$ by $1$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{2} - 6 x + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.36

Subtract $6 x^{2}$ from $- 3 x^{2}$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 6 x - 6 x + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.37

Subtract $6 x$ from $- 6 x$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + x \cdot 9 + 1 \cdot 9$

Step 1.8.9.38

Move $9$ to the left of $x$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + 9 \cdot x + 1 \cdot 9$

Step 1.8.9.39

Multiply $9$ by $1$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + 9 x + 9$

Step 1.8.9.40

Add $- 12 x$ and $9 x$ .

$x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 3 x + 9$

Step 1.8.9.41

Add $x^{3}$ and $3 x^{3}$ .

$4 x^{3} - 6 x^{2} + 9 x - 9 x^{2} - 3 x + 9$

Step 1.8.9.42

Subtract $9 x^{2}$ from $- 6 x^{2}$ .

$4 x^{3} - 15 x^{2} + 9 x - 3 x + 9$

Step 1.8.9.43

Subtract $3 x$ from $9 x$ .

$4 x^{3} - 15 x^{2} + 6 x + 9$

Step 2

Find the second derivative of the function.

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Step 2.1

By the Sum Rule, the derivative of $4 x^{3} - 15 x^{2} + 6 x + 9$ with respect to $x$ is $\frac{d}{d x} [4 x^{3}] + \frac{d}{d x} [- 15 x^{2}] + \frac{d}{d x} [6 x] + \frac{d}{d x} [9]$ .

$f'' (x) = \frac{d}{d x} (4 x^{3}) + \frac{d}{d x} (- 15 x^{2}) + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.2

Evaluate $\frac{d}{d x} [4 x^{3}]$ .

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Step 2.2.1

Since $4$ is constant with respect to $x$ , the derivative of $4 x^{3}$ with respect to $x$ is $4 \frac{d}{d x} [x^{3}]$ .

$f'' (x) = 4 \frac{d}{d x} (x^{3}) + \frac{d}{d x} (- 15 x^{2}) + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.2.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

$f'' (x) = 4 (3 x^{2}) + \frac{d}{d x} (- 15 x^{2}) + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.2.3

Multiply $3$ by $4$ .

$f'' (x) = 12 x^{2} + \frac{d}{d x} (- 15 x^{2}) + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.3

Evaluate $\frac{d}{d x} [- 15 x^{2}]$ .

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Step 2.3.1

Since $- 15$ is constant with respect to $x$ , the derivative of $- 15 x^{2}$ with respect to $x$ is $- 15 \frac{d}{d x} [x^{2}]$ .

$f'' (x) = 12 x^{2} - 15 \frac{d}{d x} x^{2} + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$f'' (x) = 12 x^{2} - 15 (2 x) + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.3.3

Multiply $2$ by $- 15$ .

$f'' (x) = 12 x^{2} - 30 x + \frac{d}{d x} (6 x) + \frac{d}{d x} (9)$

Step 2.4

Evaluate $\frac{d}{d x} [6 x]$ .

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Step 2.4.1

Since $6$ is constant with respect to $x$ , the derivative of $6 x$ with respect to $x$ is $6 \frac{d}{d x} [x]$ .

$f'' (x) = 12 x^{2} - 30 x + 6 \frac{d}{d x} (x) + \frac{d}{d x} (9)$

Step 2.4.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$f'' (x) = 12 x^{2} - 30 x + 6 \cdot 1 + \frac{d}{d x} (9)$

Step 2.4.3

Multiply $6$ by $1$ .

$f'' (x) = 12 x^{2} - 30 x + 6 + \frac{d}{d x} (9)$

Step 2.5

Differentiate using the Constant Rule.

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Step 2.5.1

Since $9$ is constant with respect to $x$ , the derivative of $9$ with respect to $x$ is $0$ .

$f'' (x) = 12 x^{2} - 30 x + 6 + 0$

Step 2.5.2

Add $12 x^{2} - 30 x + 6$ and $0$ .

$f'' (x) = 12 x^{2} - 30 x + 6$

Step 3

To find the local maximum and minimum values of the function, set the derivative equal to $0$ and solve.

$4 x^{3} - 15 x^{2} + 6 x + 9 = 0$

Step 4

Find the first derivative.

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Step 4.1

Find the first derivative.

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Step 4.1.1

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$f' (x) = \frac{d}{d x} (x ((x - 3) (x - 3)) (x + 1))$

Step 4.1.2

Expand $(x - 3) (x - 3)$ using the FOIL Method.

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Step 4.1.2.1

Apply the distributive property.

$f' (x) = \frac{d}{d x} (x (x (x - 3) - 3 (x - 3)) (x + 1))$

Step 4.1.2.2

Apply the distributive property.

$f' (x) = \frac{d}{d x} (x (x \cdot x + x \cdot - 3 - 3 (x - 3)) (x + 1))$

Step 4.1.2.3

Apply the distributive property.

$f' (x) = \frac{d}{d x} (x (x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3) (x + 1))$

Step 4.1.3

Simplify and combine like terms.

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Step 4.1.3.1

Simplify each term.

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Step 4.1.3.1.1

Multiply $x$ by $x$ .

$f' (x) = \frac{d}{d x} (x (x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3) (x + 1))$

Step 4.1.3.1.2

Move $- 3$ to the left of $x$ .

$f' (x) = \frac{d}{d x} (x (x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3) (x + 1))$

Step 4.1.3.1.3

Multiply $- 3$ by $- 3$ .

$f' (x) = \frac{d}{d x} (x (x^{2} - 3 x - 3 x + 9) (x + 1))$

Step 4.1.3.2

Subtract $3 x$ from $- 3 x$ .

$f' (x) = \frac{d}{d x} (x (x^{2} - 6 x + 9) (x + 1))$

Step 4.1.4

$f' (x) = x (x^{2} - 6 x + 9) \frac{d}{d x} (x + 1) + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.5

Differentiate.

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Step 4.1.5.1

By the Sum Rule, the derivative of $x + 1$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [1]$ .

$f' (x) = x (x^{2} - 6 x + 9) (\frac{d}{d x} (x) + \frac{d}{d x} (1)) + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.5.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$f' (x) = x (x^{2} - 6 x + 9) (1 + \frac{d}{d x} (1)) + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.5.3

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$f' (x) = x (x^{2} - 6 x + 9) (1 + 0) + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.5.4

Simplify the expression.

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Step 4.1.5.4.1

Add $1$ and $0$ .

$f' (x) = x (x^{2} - 6 x + 9) \cdot 1 + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.5.4.2

Multiply $x$ by $1$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) \frac{d}{d x} (x (x^{2} - 6 x + 9))$

Step 4.1.6

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x$ and $g (x) = x^{2} - 6 x + 9$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x \frac{d}{d x} (x^{2} - 6 x + 9) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7

Differentiate.

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Step 4.1.7.1

By the Sum Rule, the derivative of $x^{2} - 6 x + 9$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [9]$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (\frac{d}{d x} (x^{2}) + \frac{d}{d x} (- 6 x) + \frac{d}{d x} (9)) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x + \frac{d}{d x} (- 6 x) + \frac{d}{d x} (9)) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.3

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x$ with respect to $x$ is $- 6 \frac{d}{d x} [x]$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 \frac{d}{d x} x + \frac{d}{d x} (9)) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.4

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 \cdot 1 + \frac{d}{d x} (9)) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.5

Multiply $- 6$ by $1$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 + \frac{d}{d x} (9)) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.6

Since $9$ is constant with respect to $x$ , the derivative of $9$ with respect to $x$ is $0$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6 + 0) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.7

Add $2 x - 6$ and $0$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + (x^{2} - 6 x + 9) \frac{d}{d x} (x))$

Step 4.1.7.8

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + (x^{2} - 6 x + 9) \cdot 1)$

Step 4.1.7.9

Multiply $x^{2} - 6 x + 9$ by $1$ .

$f' (x) = x (x^{2} - 6 x + 9) + (x + 1) (x (2 x - 6) + x^{2} - 6 x + 9)$

Step 4.1.8

Simplify.

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Step 4.1.8.1

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x - 6) + x^{2} - 6 x + 9)$

Step 4.1.8.2

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x) + x \cdot - 6 + x^{2} - 6 x + 9)$

Step 4.1.8.3

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + (x + 1) (x (2 x)) + (x + 1) (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 4.1.8.4

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + (x + 1) (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 4.1.8.5

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + (x + 1) x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 4.1.8.6

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + (x + 1) (- 6 x) + (x + 1) \cdot 9$

Step 4.1.8.7

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + (x + 1) \cdot 9$

Step 4.1.8.8

Apply the distributive property.

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9

Combine terms.

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Step 4.1.8.9.1

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 4.1.8.9.1.1

Multiply $x$ by $x^{2}$ .

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Step 4.1.8.9.1.1.1

Raise $x$ to the power of $1$ .

$f' (x) = x \cdot x^{2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.1.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{1 + 2} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.1.2

Add $1$ and $2$ .

$f' (x) = x^{3} + x (- 6 x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.2

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 (x \cdot x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.3

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 (x \cdot x) + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{1 + 1} + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.5

Add $1$ and $1$ .

$f' (x) = x^{3} - 6 x^{2} + x \cdot 9 + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.6

Move $9$ to the left of $x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 \cdot x + x (x (2 x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.7

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + x (2 (x \cdot x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.8

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + x (2 (x \cdot x)) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.9

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + x (2 x^{1 + 1}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.10

Add $1$ and $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + x (2 x^{2}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.11

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 (x \cdot x^{2}) + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.12

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{1 + 2} + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.13

Add $1$ and $2$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (x (2 x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.14

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 (x \cdot x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.15

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 (x \cdot x)) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.16

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 x^{1 + 1}) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.17

Add $1$ and $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 1 (2 x^{2}) + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.18

Multiply $2$ by $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} + x (x \cdot - 6) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.19

Move $- 6$ to the left of $x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} + x (- 6 \cdot x) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.20

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 (x \cdot x) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.21

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 (x \cdot x) + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.22

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{1 + 1} + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.23

Add $1$ and $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} + 1 (x \cdot - 6) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.24

Move $- 6$ to the left of $x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} + 1 (- 6 \cdot x) + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.25

Multiply $- 6$ by $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} + 2 x^{2} - 6 x^{2} - 6 x + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.26

Subtract $6 x^{2}$ from $2 x^{2}$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.27

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 4.1.8.9.27.1

Multiply $x$ by $x^{2}$ .

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Step 4.1.8.9.27.1.1

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x \cdot x^{2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.27.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{1 + 2} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.27.2

Add $1$ and $2$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{3} + 1 x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.28

Multiply $x^{2}$ by $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 2 x^{3} - 4 x^{2} - 6 x + x^{3} + x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.29

Add $2 x^{3}$ and $x^{3}$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 4 x^{2} - 6 x + x^{2} + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.30

Add $- 4 x^{2}$ and $x^{2}$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x + x (- 6 x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.31

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 (x \cdot x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.32

Raise $x$ to the power of $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 (x \cdot x) + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.33

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{1 + 1} + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.34

Add $1$ and $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{2} + 1 (- 6 x) + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.35

Multiply $- 6$ by $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 3 x^{2} - 6 x - 6 x^{2} - 6 x + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.36

Subtract $6 x^{2}$ from $- 3 x^{2}$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 6 x - 6 x + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.37

Subtract $6 x$ from $- 6 x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + x \cdot 9 + 1 \cdot 9$

Step 4.1.8.9.38

Move $9$ to the left of $x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + 9 \cdot x + 1 \cdot 9$

Step 4.1.8.9.39

Multiply $9$ by $1$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 12 x + 9 x + 9$

Step 4.1.8.9.40

Add $- 12 x$ and $9 x$ .

$f' (x) = x^{3} - 6 x^{2} + 9 x + 3 x^{3} - 9 x^{2} - 3 x + 9$

Step 4.1.8.9.41

Add $x^{3}$ and $3 x^{3}$ .

$f' (x) = 4 x^{3} - 6 x^{2} + 9 x - 9 x^{2} - 3 x + 9$

Step 4.1.8.9.42

Subtract $9 x^{2}$ from $- 6 x^{2}$ .

$f' (x) = 4 x^{3} - 15 x^{2} + 9 x - 3 x + 9$

Step 4.1.8.9.43

Subtract $3 x$ from $9 x$ .

$f' (x) = 4 x^{3} - 15 x^{2} + 6 x + 9$

Step 4.2

The first derivative of $f (x)$ with respect to $x$ is $4 x^{3} - 15 x^{2} + 6 x + 9$ .

$4 x^{3} - 15 x^{2} + 6 x + 9$

Step 5

Set the first derivative equal to $0$ then solve the equation $4 x^{3} - 15 x^{2} + 6 x + 9 = 0$ .

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Step 5.1

Set the first derivative equal to $0$ .

$4 x^{3} - 15 x^{2} + 6 x + 9 = 0$

Step 5.2

Factor $4 x^{3} - 15 x^{2} + 6 x + 9$ using the rational roots test.

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Step 5.2.1

If a polynomial function has integer coefficients, then every rational zero will have the form $\frac{p}{q}$ where $p$ is a factor of the constant and $q$ is a factor of the leading coefficient.

$p = \pm 1, \pm 9, \pm 3$

$q = \pm 1, \pm 4, \pm 2$

Step 5.2.2

Find every combination of $\pm \frac{p}{q}$ . These are the possible roots of the polynomial function.

$\pm 1, \pm 0.25, \pm 0.5, \pm 9, \pm 2.25, \pm 4.5, \pm 3, \pm 0.75, \pm 1.5$

Step 5.2.3

Substitute $3$ and simplify the expression. In this case, the expression is equal to $0$ so $3$ is a root of the polynomial.

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Step 5.2.3.1

Substitute $3$ into the polynomial.

$4 \cdot 3^{3} - 15 \cdot 3^{2} + 6 \cdot 3 + 9$

Step 5.2.3.2

Raise $3$ to the power of $3$ .

$4 \cdot 27 - 15 \cdot 3^{2} + 6 \cdot 3 + 9$

Step 5.2.3.3

Multiply $4$ by $27$ .

$108 - 15 \cdot 3^{2} + 6 \cdot 3 + 9$

Step 5.2.3.4

Raise $3$ to the power of $2$ .

$108 - 15 \cdot 9 + 6 \cdot 3 + 9$

Step 5.2.3.5

Multiply $- 15$ by $9$ .

$108 - 135 + 6 \cdot 3 + 9$

Step 5.2.3.6

Subtract $135$ from $108$ .

$- 27 + 6 \cdot 3 + 9$

Step 5.2.3.7

Multiply $6$ by $3$ .

$- 27 + 18 + 9$

Step 5.2.3.8

Add $- 27$ and $18$ .

$- 9 + 9$

Step 5.2.3.9

Add $- 9$ and $9$ .

$0$

Step 5.2.4

Since $3$ is a known root, divide the polynomial by $x - 3$ to find the quotient polynomial. This polynomial can then be used to find the remaining roots.

$\frac{4 x^{3} - 15 x^{2} + 6 x + 9}{x - 3}$

Step 5.2.5

Divide $4 x^{3} - 15 x^{2} + 6 x + 9$ by $x - 3$ .

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Step 5.2.5.1

Set up the polynomials to be divided. If there is not a term for every exponent, insert one with a value of $0$ .

$x$

$3$

$4 x^{3}$

$15 x^{2}$

$6 x$

$9$

Step 5.2.5.2

Divide the highest order term in the dividend $4 x^{3}$ by the highest order term in divisor $x$ .

					$4 x^{2}$
	$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$

Step 5.2.5.3

Multiply the new quotient term by the divisor.

				$4 x^{2}$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			+	$4 x^{3}$	-	$12 x^{2}$

Step 5.2.5.4

The expression needs to be subtracted from the dividend, so change all the signs in $4 x^{3} - 12 x^{2}$

				$4 x^{2}$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$

Step 5.2.5.5

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$4 x^{2}$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$

Step 5.2.5.6

Pull the next terms from the original dividend down into the current dividend.

				$4 x^{2}$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$

Step 5.2.5.7

Divide the highest order term in the dividend $- 3 x^{2}$ by the highest order term in divisor $x$ .

				$4 x^{2}$	-	$3 x$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$

Step 5.2.5.8

Multiply the new quotient term by the divisor.

				$4 x^{2}$	-	$3 x$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					-	$3 x^{2}$	+	$9 x$

Step 5.2.5.9

The expression needs to be subtracted from the dividend, so change all the signs in $- 3 x^{2} + 9 x$

				$4 x^{2}$	-	$3 x$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$

Step 5.2.5.10

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$4 x^{2}$	-	$3 x$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$

Step 5.2.5.11

Pull the next terms from the original dividend down into the current dividend.

				$4 x^{2}$	-	$3 x$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$	+	$9$

Step 5.2.5.12

Divide the highest order term in the dividend $- 3 x$ by the highest order term in divisor $x$ .

				$4 x^{2}$	-	$3 x$	-	$3$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$	+	$9$

Step 5.2.5.13

Multiply the new quotient term by the divisor.

				$4 x^{2}$	-	$3 x$	-	$3$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$	+	$9$
							-	$3 x$	+	$9$

Step 5.2.5.14

The expression needs to be subtracted from the dividend, so change all the signs in $- 3 x + 9$

				$4 x^{2}$	-	$3 x$	-	$3$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$	+	$9$
							+	$3 x$	-	$9$

Step 5.2.5.15

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$4 x^{2}$	-	$3 x$	-	$3$
$x$	-	$3$		$4 x^{3}$	-	$15 x^{2}$	+	$6 x$	+	$9$
			-	$4 x^{3}$	+	$12 x^{2}$
					-	$3 x^{2}$	+	$6 x$
					+	$3 x^{2}$	-	$9 x$
							-	$3 x$	+	$9$
							+	$3 x$	-	$9$
										$0$

Step 5.2.5.16

Since the remander is $0$ , the final answer is the quotient.

$4 x^{2} - 3 x - 3$

Step 5.2.6

Write $4 x^{3} - 15 x^{2} + 6 x + 9$ as a set of factors.

$(x - 3) (4 x^{2} - 3 x - 3) = 0$

Step 5.3

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 3 = 0$

$4 x^{2} - 3 x - 3 = 0$

Step 5.4

Set $x - 3$ equal to $0$ and solve for $x$ .

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Step 5.4.1

Set $x - 3$ equal to $0$ .

$x - 3 = 0$

Step 5.4.2

Add $3$ to both sides of the equation.

$x = 3$

Step 5.5

Set $4 x^{2} - 3 x - 3$ equal to $0$ and solve for $x$ .

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Step 5.5.1

Set $4 x^{2} - 3 x - 3$ equal to $0$ .

$4 x^{2} - 3 x - 3 = 0$

Step 5.5.2

Solve $4 x^{2} - 3 x - 3 = 0$ for $x$ .

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Step 5.5.2.1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 5.5.2.2

Substitute the values $a = 4$ , $b = - 3$ , and $c = - 3$ into the quadratic formula and solve for $x$ .

$\frac{3 \pm \sqrt{{(- 3)}^{2} - 4 \cdot (4 \cdot - 3)}}{2 \cdot 4}$

Step 5.5.2.3

Simplify.

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Step 5.5.2.3.1

Simplify the numerator.

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Step 5.5.2.3.1.1

Raise $- 3$ to the power of $2$ .

$x = \frac{3 \pm \sqrt{9 - 4 \cdot 4 \cdot - 3}}{2 \cdot 4}$

Step 5.5.2.3.1.2

Multiply $- 4 \cdot 4 \cdot - 3$ .

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Step 5.5.2.3.1.2.1

Multiply $- 4$ by $4$ .

$x = \frac{3 \pm \sqrt{9 - 16 \cdot - 3}}{2 \cdot 4}$

Step 5.5.2.3.1.2.2

Multiply $- 16$ by $- 3$ .

$x = \frac{3 \pm \sqrt{9 + 48}}{2 \cdot 4}$

Step 5.5.2.3.1.3

Add $9$ and $48$ .

$x = \frac{3 \pm \sqrt{57}}{2 \cdot 4}$

Step 5.5.2.3.2

Multiply $2$ by $4$ .

$x = \frac{3 \pm \sqrt{57}}{8}$

Step 5.5.2.4

The final answer is the combination of both solutions.

$x = \frac{3 + \sqrt{57}}{8}, \frac{3 - \sqrt{57}}{8}$

Step 5.6

The final solution is all the values that make $(x - 3) (4 x^{2} - 3 x - 3) = 0$ true.

$x = 3, \frac{3 + \sqrt{57}}{8}, \frac{3 - \sqrt{57}}{8}$

Step 6

Find the values where the derivative is undefined.

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Step 6.1

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Step 7

Critical points to evaluate.

$x = 3, \frac{3 + \sqrt{57}}{8}, \frac{3 - \sqrt{57}}{8}$

Step 8

Evaluate the second derivative at $x = 3$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$12 {(3)}^{2} - 30 \cdot 3 + 6$

Step 9

Evaluate the second derivative.

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Step 9.1

Simplify each term.

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Step 9.1.1

Raise $3$ to the power of $2$ .

$12 \cdot 9 - 30 \cdot 3 + 6$

Step 9.1.2

Multiply $12$ by $9$ .

$108 - 30 \cdot 3 + 6$

Step 9.1.3

Multiply $- 30$ by $3$ .

$108 - 90 + 6$

Step 9.2

Simplify by adding and subtracting.

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Step 9.2.1

Subtract $90$ from $108$ .

$18 + 6$

Step 9.2.2

Add $18$ and $6$ .

$24$

Step 10

$x = 3$ is a local minimum because the value of the second derivative is positive. This is referred to as the second derivative test.

$x = 3$ is a local minimum

Step 11

Find the y-value when $x = 3$ .

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Step 11.1

Replace the variable $x$ with $3$ in the expression.

$f (3) = (3) {((3) - 3)}^{2} ((3) + 1)$

Step 11.2

Simplify the result.

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Step 11.2.1

Subtract $3$ from $3$ .

$f (3) = 3 \cdot (0^{2} ((3) + 1))$

Step 11.2.2

Raising $0$ to any positive power yields $0$ .

$f (3) = 3 \cdot (0 ((3) + 1))$

Step 11.2.3

Multiply $3$ by $0$ .

$f (3) = 0 ((3) + 1)$

Step 11.2.4

Add $3$ and $1$ .

$f (3) = 0 \cdot 4$

Step 11.2.5

Multiply $0$ by $4$ .

$f (3) = 0$

Step 11.2.6

The final answer is $0$ .

$y = 0$

Step 12

Evaluate the second derivative at $x = \frac{3 + \sqrt{57}}{8}$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$12 {(\frac{3 + \sqrt{57}}{8})}^{2} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13

Evaluate the second derivative.

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Step 13.1

Simplify each term.

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Step 13.1.1

Apply the product rule to $\frac{3 + \sqrt{57}}{8}$ .

$12 \frac{{(3 + \sqrt{57})}^{2}}{8^{2}} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.2

Raise $8$ to the power of $2$ .

$12 \frac{{(3 + \sqrt{57})}^{2}}{64} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.3

Cancel the common factor of $4$ .

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Step 13.1.3.1

Factor $4$ out of $12$ .

$4 (3) \frac{{(3 + \sqrt{57})}^{2}}{64} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.3.2

Factor $4$ out of $64$ .

$4 \cdot 3 \frac{{(3 + \sqrt{57})}^{2}}{4 \cdot 16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.3.3

Cancel the common factor.

$4 \cdot 3 \frac{{(3 + \sqrt{57})}^{2}}{4 \cdot 16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.3.4

Rewrite the expression.

$3 \frac{{(3 + \sqrt{57})}^{2}}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.4

Combine $3$ and $\frac{{(3 + \sqrt{57})}^{2}}{16}$ .

$\frac{3 {(3 + \sqrt{57})}^{2}}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.5

Rewrite ${(3 + \sqrt{57})}^{2}$ as $(3 + \sqrt{57}) (3 + \sqrt{57})$ .

$\frac{3 ((3 + \sqrt{57}) (3 + \sqrt{57}))}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.6

Expand $(3 + \sqrt{57}) (3 + \sqrt{57})$ using the FOIL Method.

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Step 13.1.6.1

Apply the distributive property.

$\frac{3 (3 (3 + \sqrt{57}) + \sqrt{57} (3 + \sqrt{57}))}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.6.2

Apply the distributive property.

$\frac{3 (3 \cdot 3 + 3 \sqrt{57} + \sqrt{57} (3 + \sqrt{57}))}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.6.3

Apply the distributive property.

$\frac{3 (3 \cdot 3 + 3 \sqrt{57} + \sqrt{57} \cdot 3 + \sqrt{57} \sqrt{57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7

Simplify and combine like terms.

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Step 13.1.7.1

Simplify each term.

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Step 13.1.7.1.1

Multiply $3$ by $3$ .

$\frac{3 (9 + 3 \sqrt{57} + \sqrt{57} \cdot 3 + \sqrt{57} \sqrt{57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.1.2

Move $3$ to the left of $\sqrt{57}$ .

$\frac{3 (9 + 3 \sqrt{57} + 3 \cdot \sqrt{57} + \sqrt{57} \sqrt{57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.1.3

Combine using the product rule for radicals.

$\frac{3 (9 + 3 \sqrt{57} + 3 \sqrt{57} + \sqrt{57 \cdot 57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.1.4

Multiply $57$ by $57$ .

$\frac{3 (9 + 3 \sqrt{57} + 3 \sqrt{57} + \sqrt{3249})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.1.5

Rewrite $3249$ as $57^{2}$ .

$\frac{3 (9 + 3 \sqrt{57} + 3 \sqrt{57} + \sqrt{57^{2}})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.1.6

Pull terms out from under the radical, assuming positive real numbers.

$\frac{3 (9 + 3 \sqrt{57} + 3 \sqrt{57} + 57)}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.2

Add $9$ and $57$ .

$\frac{3 (66 + 3 \sqrt{57} + 3 \sqrt{57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.7.3

Add $3 \sqrt{57}$ and $3 \sqrt{57}$ .

$\frac{3 (66 + 6 \sqrt{57})}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.8

Cancel the common factor of $66 + 6 \sqrt{57}$ and $16$ .

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Step 13.1.8.1

Factor $2$ out of $3 (66 + 6 \sqrt{57})$ .

$\frac{2 (3 (33 + 3 \sqrt{57}))}{16} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.8.2

Cancel the common factors.

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Step 13.1.8.2.1

Factor $2$ out of $16$ .

$\frac{2 (3 (33 + 3 \sqrt{57}))}{2 (8)} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.8.2.2

Cancel the common factor.

$\frac{2 (3 (33 + 3 \sqrt{57}))}{2 \cdot 8} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.8.2.3

Rewrite the expression.

$\frac{3 (33 + 3 \sqrt{57})}{8} - 30 \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.9

Cancel the common factor of $2$ .

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Step 13.1.9.1

Factor $2$ out of $- 30$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} + 2 (- 15) \frac{3 + \sqrt{57}}{8} + 6$

Step 13.1.9.2

Factor $2$ out of $8$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} + 2 \cdot - 15 \frac{3 + \sqrt{57}}{2 \cdot 4} + 6$

Step 13.1.9.3

Cancel the common factor.

$\frac{3 (33 + 3 \sqrt{57})}{8} + 2 \cdot - 15 \frac{3 + \sqrt{57}}{2 \cdot 4} + 6$

Step 13.1.9.4

Rewrite the expression.

$\frac{3 (33 + 3 \sqrt{57})}{8} - 15 \frac{3 + \sqrt{57}}{4} + 6$

Step 13.1.10

Combine $- 15$ and $\frac{3 + \sqrt{57}}{4}$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} + \frac{- 15 (3 + \sqrt{57})}{4} + 6$

Step 13.1.11

Move the negative in front of the fraction.

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57})}{4} + 6$

Step 13.2

Find the common denominator.

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Step 13.2.1

Multiply $\frac{15 (3 + \sqrt{57})}{4}$ by $\frac{2}{2}$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - (\frac{15 (3 + \sqrt{57})}{4} \cdot \frac{2}{2}) + 6$

Step 13.2.2

Multiply $\frac{15 (3 + \sqrt{57})}{4}$ by $\frac{2}{2}$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{4 \cdot 2} + 6$

Step 13.2.3

Write $6$ as a fraction with denominator $1$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6}{1}$

Step 13.2.4

Multiply $\frac{6}{1}$ by $\frac{8}{8}$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6}{1} \cdot \frac{8}{8}$

Step 13.2.5

Multiply $\frac{6}{1}$ by $\frac{8}{8}$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6 \cdot 8}{8}$

Step 13.2.6

Reorder the factors of $4 \cdot 2$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{2 \cdot 4} + \frac{6 \cdot 8}{8}$

Step 13.2.7

Multiply $2$ by $4$ .

$\frac{3 (33 + 3 \sqrt{57})}{8} - \frac{15 (3 + \sqrt{57}) \cdot 2}{8} + \frac{6 \cdot 8}{8}$

Step 13.3

Combine the numerators over the common denominator.

$\frac{3 (33 + 3 \sqrt{57}) - 15 (3 + \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4

Simplify each term.

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Step 13.4.1

Apply the distributive property.

$\frac{3 \cdot 33 + 3 (3 \sqrt{57}) - 15 (3 + \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.2

Multiply $3$ by $33$ .

$\frac{99 + 3 (3 \sqrt{57}) - 15 (3 + \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.3

Multiply $3$ by $3$ .

$\frac{99 + 9 \sqrt{57} - 15 (3 + \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.4

Apply the distributive property.

$\frac{99 + 9 \sqrt{57} + (- 15 \cdot 3 - 15 \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.5

Multiply $- 15$ by $3$ .

$\frac{99 + 9 \sqrt{57} + (- 45 - 15 \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.6

Apply the distributive property.

$\frac{99 + 9 \sqrt{57} - 45 \cdot 2 - 15 \sqrt{57} \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.7

Multiply $- 45$ by $2$ .

$\frac{99 + 9 \sqrt{57} - 90 - 15 \sqrt{57} \cdot 2 + 6 \cdot 8}{8}$

Step 13.4.8

Multiply $2$ by $- 15$ .

$\frac{99 + 9 \sqrt{57} - 90 - 30 \sqrt{57} + 6 \cdot 8}{8}$

Step 13.4.9

Multiply $6$ by $8$ .

$\frac{99 + 9 \sqrt{57} - 90 - 30 \sqrt{57} + 48}{8}$

Step 13.5

Simplify by adding terms.

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Step 13.5.1

Subtract $90$ from $99$ .

$\frac{9 + 9 \sqrt{57} - 30 \sqrt{57} + 48}{8}$

Step 13.5.2

Add $9$ and $48$ .

$\frac{57 + 9 \sqrt{57} - 30 \sqrt{57}}{8}$

Step 13.5.3

Subtract $30 \sqrt{57}$ from $9 \sqrt{57}$ .

$\frac{57 - 21 \sqrt{57}}{8}$

Step 14

$x = \frac{3 + \sqrt{57}}{8}$ is a local maximum because the value of the second derivative is negative. This is referred to as the second derivative test.

$x = \frac{3 + \sqrt{57}}{8}$ is a local maximum

Step 15

Find the y-value when $x = \frac{3 + \sqrt{57}}{8}$ .

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Step 15.1

Replace the variable $x$ with $\frac{3 + \sqrt{57}}{8}$ in the expression.

$f (\frac{3 + \sqrt{57}}{8}) = (\frac{3 + \sqrt{57}}{8}) {((\frac{3 + \sqrt{57}}{8}) - 3)}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2

Simplify the result.

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Step 15.2.1

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{8}{8}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot ({(\frac{3 + \sqrt{57}}{8} - 3 \cdot \frac{8}{8})}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1))$

Step 15.2.2

Combine fractions.

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Step 15.2.2.1

Combine $- 3$ and $\frac{8}{8}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot ({(\frac{3 + \sqrt{57}}{8} + \frac{- 3 \cdot 8}{8})}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1))$

Step 15.2.2.2

Combine the numerators over the common denominator.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot ({(\frac{3 + \sqrt{57} - 3 \cdot 8}{8})}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1))$

Step 15.2.3

Simplify the numerator.

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Step 15.2.3.1

Multiply $- 3$ by $8$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot ({(\frac{3 + \sqrt{57} - 24}{8})}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1))$

Step 15.2.3.2

Subtract $24$ from $3$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot ({(\frac{- 21 + \sqrt{57}}{8})}^{2} ((\frac{3 + \sqrt{57}}{8}) + 1))$

Step 15.2.4

Simplify the expression.

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Step 15.2.4.1

Apply the product rule to $\frac{- 21 + \sqrt{57}}{8}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{{(- 21 + \sqrt{57})}^{2}}{8^{2}} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.4.2

Raise $8$ to the power of $2$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{{(- 21 + \sqrt{57})}^{2}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.4.3

Rewrite ${(- 21 + \sqrt{57})}^{2}$ as $(- 21 + \sqrt{57}) (- 21 + \sqrt{57})$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{(- 21 + \sqrt{57}) (- 21 + \sqrt{57})}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.5

Expand $(- 21 + \sqrt{57}) (- 21 + \sqrt{57})$ using the FOIL Method.

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Step 15.2.5.1

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{- 21 (- 21 + \sqrt{57}) + \sqrt{57} (- 21 + \sqrt{57})}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.5.2

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{- 21 \cdot - 21 - 21 \sqrt{57} + \sqrt{57} (- 21 + \sqrt{57})}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.5.3

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{- 21 \cdot - 21 - 21 \sqrt{57} + \sqrt{57} \cdot - 21 + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6

Simplify and combine like terms.

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Step 15.2.6.1

Simplify each term.

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Step 15.2.6.1.1

Multiply $- 21$ by $- 21$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} + \sqrt{57} \cdot - 21 + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.1.2

Move $- 21$ to the left of $\sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} - 21 \cdot \sqrt{57} + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.1.3

Combine using the product rule for radicals.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} - 21 \sqrt{57} + \sqrt{57 \cdot 57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.1.4

Multiply $57$ by $57$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} - 21 \sqrt{57} + \sqrt{3249}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.1.5

Rewrite $3249$ as $57^{2}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} - 21 \sqrt{57} + \sqrt{57^{2}}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.1.6

Pull terms out from under the radical, assuming positive real numbers.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{441 - 21 \sqrt{57} - 21 \sqrt{57} + 57}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.2

Add $441$ and $57$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{498 - 21 \sqrt{57} - 21 \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.6.3

Subtract $21 \sqrt{57}$ from $- 21 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{498 - 42 \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7

Cancel the common factor of $498 - 42 \sqrt{57}$ and $64$ .

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Step 15.2.7.1

Factor $2$ out of $498$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{2 (249) - 42 \sqrt{57}}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7.2

Factor $2$ out of $- 42 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{2 (249) + 2 (- 21 \sqrt{57})}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7.3

Factor $2$ out of $2 (249) + 2 (- 21 \sqrt{57})$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{2 (249 - 21 \sqrt{57})}{64} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7.4

Cancel the common factors.

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Step 15.2.7.4.1

Factor $2$ out of $64$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{2 (249 - 21 \sqrt{57})}{2 \cdot 32} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7.4.2

Cancel the common factor.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{2 (249 - 21 \sqrt{57})}{2 \cdot 32} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.7.4.3

Rewrite the expression.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 + \sqrt{57}}{8} \cdot \frac{249 - 21 \sqrt{57}}{32} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.8

Multiply $\frac{3 + \sqrt{57}}{8} \cdot \frac{249 - 21 \sqrt{57}}{32}$ .

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Step 15.2.8.1

Multiply $\frac{3 + \sqrt{57}}{8}$ by $\frac{249 - 21 \sqrt{57}}{32}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{(3 + \sqrt{57}) (249 - 21 \sqrt{57})}{8 \cdot 32} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.8.2

Multiply $8$ by $32$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{(3 + \sqrt{57}) (249 - 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.9

Expand $(3 + \sqrt{57}) (249 - 21 \sqrt{57})$ using the FOIL Method.

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Step 15.2.9.1

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 (249 - 21 \sqrt{57}) + \sqrt{57} (249 - 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.9.2

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 \cdot 249 + 3 (- 21 \sqrt{57}) + \sqrt{57} (249 - 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.9.3

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{3 \cdot 249 + 3 (- 21 \sqrt{57}) + \sqrt{57} \cdot 249 + \sqrt{57} (- 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10

Simplify and combine like terms.

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Step 15.2.10.1

Simplify each term.

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Step 15.2.10.1.1

Multiply $3$ by $249$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 + 3 (- 21 \sqrt{57}) + \sqrt{57} \cdot 249 + \sqrt{57} (- 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.2

Multiply $- 21$ by $3$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + \sqrt{57} \cdot 249 + \sqrt{57} (- 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.3

Move $249$ to the left of $\sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \cdot \sqrt{57} + \sqrt{57} (- 21 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.4

Multiply $\sqrt{57} (- 21 \sqrt{57})$ .

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Step 15.2.10.1.4.1

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 (\sqrt{57} \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.4.2

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 (\sqrt{57} \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.4.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 {\sqrt{57}}^{1 + 1}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.4.4

Add $1$ and $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 {\sqrt{57}}^{2}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 15.2.10.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 {(57^{\frac{1}{2}})}^{2}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 \cdot 57^{\frac{1}{2} \cdot 2}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 \cdot 57^{\frac{2}{2}}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5.4

Cancel the common factor of $2$ .

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Step 15.2.10.1.5.4.1

Cancel the common factor.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 \cdot 57^{\frac{2}{2}}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5.4.2

Rewrite the expression.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 \cdot 57}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.5.5

Evaluate the exponent.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 21 \cdot 57}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.1.6

Multiply $- 21$ by $57$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{747 - 63 \sqrt{57} + 249 \sqrt{57} - 1197}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.2

Subtract $1197$ from $747$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 450 - 63 \sqrt{57} + 249 \sqrt{57}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.10.3

Add $- 63 \sqrt{57}$ and $249 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 450 + 186 \sqrt{57}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11

Cancel the common factor of $- 450 + 186 \sqrt{57}$ and $256$ .

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Step 15.2.11.1

Factor $2$ out of $- 450$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (- 225) + 186 \sqrt{57}}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11.2

Factor $2$ out of $186 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (- 225) + 2 (93 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11.3

Factor $2$ out of $2 (- 225) + 2 (93 \sqrt{57})$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (- 225 + 93 \sqrt{57})}{256} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11.4

Cancel the common factors.

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Step 15.2.11.4.1

Factor $2$ out of $256$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (- 225 + 93 \sqrt{57})}{2 \cdot 128} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11.4.2

Cancel the common factor.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (- 225 + 93 \sqrt{57})}{2 \cdot 128} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.11.4.3

Rewrite the expression.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 + 93 \sqrt{57}}{128} \cdot ((\frac{3 + \sqrt{57}}{8}) + 1)$

Step 15.2.12

Simplify the expression.

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Step 15.2.12.1

Write $1$ as a fraction with a common denominator.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 + 93 \sqrt{57}}{128} \cdot (\frac{3 + \sqrt{57}}{8} + \frac{8}{8})$

Step 15.2.12.2

Combine the numerators over the common denominator.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 + 93 \sqrt{57}}{128} \cdot \frac{3 + \sqrt{57} + 8}{8}$

Step 15.2.12.3

Add $3$ and $8$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 + 93 \sqrt{57}}{128} \cdot \frac{11 + \sqrt{57}}{8}$

Step 15.2.13

Multiply $\frac{- 225 + 93 \sqrt{57}}{128} \cdot \frac{11 + \sqrt{57}}{8}$ .

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Step 15.2.13.1

Multiply $\frac{- 225 + 93 \sqrt{57}}{128}$ by $\frac{11 + \sqrt{57}}{8}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{(- 225 + 93 \sqrt{57}) (11 + \sqrt{57})}{128 \cdot 8}$

Step 15.2.13.2

Multiply $128$ by $8$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{(- 225 + 93 \sqrt{57}) (11 + \sqrt{57})}{1024}$

Step 15.2.14

Expand $(- 225 + 93 \sqrt{57}) (11 + \sqrt{57})$ using the FOIL Method.

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Step 15.2.14.1

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 (11 + \sqrt{57}) + 93 \sqrt{57} (11 + \sqrt{57})}{1024}$

Step 15.2.14.2

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 \cdot 11 - 225 \sqrt{57} + 93 \sqrt{57} (11 + \sqrt{57})}{1024}$

Step 15.2.14.3

Apply the distributive property.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 225 \cdot 11 - 225 \sqrt{57} + 93 \sqrt{57} \cdot 11 + 93 \sqrt{57} \sqrt{57}}{1024}$

Step 15.2.15

Simplify and combine like terms.

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Step 15.2.15.1

Simplify each term.

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Step 15.2.15.1.1

Multiply $- 225$ by $11$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 93 \sqrt{57} \cdot 11 + 93 \sqrt{57} \sqrt{57}}{1024}$

Step 15.2.15.1.2

Multiply $11$ by $93$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \sqrt{57} \sqrt{57}}{1024}$

Step 15.2.15.1.3

Multiply $93 \sqrt{57} \sqrt{57}$ .

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Step 15.2.15.1.3.1

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 (\sqrt{57} \sqrt{57})}{1024}$

Step 15.2.15.1.3.2

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 (\sqrt{57} \sqrt{57})}{1024}$

Step 15.2.15.1.3.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 {\sqrt{57}}^{1 + 1}}{1024}$

Step 15.2.15.1.3.4

Add $1$ and $1$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 {\sqrt{57}}^{2}}{1024}$

Step 15.2.15.1.4

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 15.2.15.1.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 {(57^{\frac{1}{2}})}^{2}}{1024}$

Step 15.2.15.1.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \cdot 57^{\frac{1}{2} \cdot 2}}{1024}$

Step 15.2.15.1.4.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \cdot 57^{\frac{2}{2}}}{1024}$

Step 15.2.15.1.4.4

Cancel the common factor of $2$ .

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Step 15.2.15.1.4.4.1

Cancel the common factor.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \cdot 57^{\frac{2}{2}}}{1024}$

Step 15.2.15.1.4.4.2

Rewrite the expression.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \cdot 57}{1024}$

Step 15.2.15.1.4.5

Evaluate the exponent.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 93 \cdot 57}{1024}$

Step 15.2.15.1.5

Multiply $93$ by $57$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{- 2475 - 225 \sqrt{57} + 1023 \sqrt{57} + 5301}{1024}$

Step 15.2.15.2

Add $- 2475$ and $5301$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2826 - 225 \sqrt{57} + 1023 \sqrt{57}}{1024}$

Step 15.2.15.3

Add $- 225 \sqrt{57}$ and $1023 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2826 + 798 \sqrt{57}}{1024}$

Step 15.2.16

Cancel the common factor of $2826 + 798 \sqrt{57}$ and $1024$ .

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Step 15.2.16.1

Factor $2$ out of $2826$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (1413) + 798 \sqrt{57}}{1024}$

Step 15.2.16.2

Factor $2$ out of $798 \sqrt{57}$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (1413) + 2 (399 \sqrt{57})}{1024}$

Step 15.2.16.3

Factor $2$ out of $2 (1413) + 2 (399 \sqrt{57})$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (1413 + 399 \sqrt{57})}{1024}$

Step 15.2.16.4

Cancel the common factors.

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Step 15.2.16.4.1

Factor $2$ out of $1024$ .

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (1413 + 399 \sqrt{57})}{2 \cdot 512}$

Step 15.2.16.4.2

Cancel the common factor.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{2 (1413 + 399 \sqrt{57})}{2 \cdot 512}$

Step 15.2.16.4.3

Rewrite the expression.

$f (\frac{3 + \sqrt{57}}{8}) = \frac{1413 + 399 \sqrt{57}}{512}$

Step 15.2.17

The final answer is $\frac{1413 + 399 \sqrt{57}}{512}$ .

$y = \frac{1413 + 399 \sqrt{57}}{512}$

Step 16

Evaluate the second derivative at $x = \frac{3 - \sqrt{57}}{8}$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$12 {(\frac{3 - \sqrt{57}}{8})}^{2} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17

Evaluate the second derivative.

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Step 17.1

Simplify each term.

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Step 17.1.1

Apply the product rule to $\frac{3 - \sqrt{57}}{8}$ .

$12 \frac{{(3 - \sqrt{57})}^{2}}{8^{2}} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.2

Raise $8$ to the power of $2$ .

$12 \frac{{(3 - \sqrt{57})}^{2}}{64} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.3

Cancel the common factor of $4$ .

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Step 17.1.3.1

Factor $4$ out of $12$ .

$4 (3) \frac{{(3 - \sqrt{57})}^{2}}{64} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.3.2

Factor $4$ out of $64$ .

$4 \cdot 3 \frac{{(3 - \sqrt{57})}^{2}}{4 \cdot 16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.3.3

Cancel the common factor.

$4 \cdot 3 \frac{{(3 - \sqrt{57})}^{2}}{4 \cdot 16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.3.4

Rewrite the expression.

$3 \frac{{(3 - \sqrt{57})}^{2}}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.4

Combine $3$ and $\frac{{(3 - \sqrt{57})}^{2}}{16}$ .

$\frac{3 {(3 - \sqrt{57})}^{2}}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.5

Rewrite ${(3 - \sqrt{57})}^{2}$ as $(3 - \sqrt{57}) (3 - \sqrt{57})$ .

$\frac{3 ((3 - \sqrt{57}) (3 - \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.6

Expand $(3 - \sqrt{57}) (3 - \sqrt{57})$ using the FOIL Method.

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Step 17.1.6.1

Apply the distributive property.

$\frac{3 (3 (3 - \sqrt{57}) - \sqrt{57} (3 - \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.6.2

Apply the distributive property.

$\frac{3 (3 \cdot 3 + 3 (- \sqrt{57}) - \sqrt{57} (3 - \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.6.3

Apply the distributive property.

$\frac{3 (3 \cdot 3 + 3 (- \sqrt{57}) - \sqrt{57} \cdot 3 - \sqrt{57} (- \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7

Simplify and combine like terms.

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Step 17.1.7.1

Simplify each term.

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Step 17.1.7.1.1

Multiply $3$ by $3$ .

$\frac{3 (9 + 3 (- \sqrt{57}) - \sqrt{57} \cdot 3 - \sqrt{57} (- \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.2

Multiply $- 1$ by $3$ .

$\frac{3 (9 - 3 \sqrt{57} - \sqrt{57} \cdot 3 - \sqrt{57} (- \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.3

Multiply $3$ by $- 1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} - \sqrt{57} (- \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4

Multiply $- \sqrt{57} (- \sqrt{57})$ .

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Step 17.1.7.1.4.1

Multiply $- 1$ by $- 1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 1 \sqrt{57} \sqrt{57})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4.2

Multiply $\sqrt{57}$ by $1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + \sqrt{57} \sqrt{57})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4.3

Raise $\sqrt{57}$ to the power of $1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + {\sqrt{57}}^{1} \sqrt{57})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4.4

Raise $\sqrt{57}$ to the power of $1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + {\sqrt{57}}^{1} {\sqrt{57}}^{1})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + {\sqrt{57}}^{1 + 1})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.4.6

Add $1$ and $1$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + {\sqrt{57}}^{2})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 17.1.7.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + {(57^{\frac{1}{2}})}^{2})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 57^{\frac{1}{2} \cdot 2})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 57^{\frac{2}{2}})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5.4

Cancel the common factor of $2$ .

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Step 17.1.7.1.5.4.1

Cancel the common factor.

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 57^{\frac{2}{2}})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5.4.2

Rewrite the expression.

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 57^{1})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.1.5.5

Evaluate the exponent.

$\frac{3 (9 - 3 \sqrt{57} - 3 \sqrt{57} + 57)}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.2

Add $9$ and $57$ .

$\frac{3 (66 - 3 \sqrt{57} - 3 \sqrt{57})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.7.3

Subtract $3 \sqrt{57}$ from $- 3 \sqrt{57}$ .

$\frac{3 (66 - 6 \sqrt{57})}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.8

Cancel the common factor of $66 - 6 \sqrt{57}$ and $16$ .

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Step 17.1.8.1

Factor $2$ out of $3 (66 - 6 \sqrt{57})$ .

$\frac{2 (3 (33 - 3 \sqrt{57}))}{16} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.8.2

Cancel the common factors.

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Step 17.1.8.2.1

Factor $2$ out of $16$ .

$\frac{2 (3 (33 - 3 \sqrt{57}))}{2 (8)} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.8.2.2

Cancel the common factor.

$\frac{2 (3 (33 - 3 \sqrt{57}))}{2 \cdot 8} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.8.2.3

Rewrite the expression.

$\frac{3 (33 - 3 \sqrt{57})}{8} - 30 \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.9

Cancel the common factor of $2$ .

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Step 17.1.9.1

Factor $2$ out of $- 30$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} + 2 (- 15) \frac{3 - \sqrt{57}}{8} + 6$

Step 17.1.9.2

Factor $2$ out of $8$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} + 2 \cdot - 15 \frac{3 - \sqrt{57}}{2 \cdot 4} + 6$

Step 17.1.9.3

Cancel the common factor.

$\frac{3 (33 - 3 \sqrt{57})}{8} + 2 \cdot - 15 \frac{3 - \sqrt{57}}{2 \cdot 4} + 6$

Step 17.1.9.4

Rewrite the expression.

$\frac{3 (33 - 3 \sqrt{57})}{8} - 15 \frac{3 - \sqrt{57}}{4} + 6$

Step 17.1.10

Combine $- 15$ and $\frac{3 - \sqrt{57}}{4}$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} + \frac{- 15 (3 - \sqrt{57})}{4} + 6$

Step 17.1.11

Move the negative in front of the fraction.

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57})}{4} + 6$

Step 17.2

Find the common denominator.

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Step 17.2.1

Multiply $\frac{15 (3 - \sqrt{57})}{4}$ by $\frac{2}{2}$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - (\frac{15 (3 - \sqrt{57})}{4} \cdot \frac{2}{2}) + 6$

Step 17.2.2

Multiply $\frac{15 (3 - \sqrt{57})}{4}$ by $\frac{2}{2}$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{4 \cdot 2} + 6$

Step 17.2.3

Write $6$ as a fraction with denominator $1$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6}{1}$

Step 17.2.4

Multiply $\frac{6}{1}$ by $\frac{8}{8}$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6}{1} \cdot \frac{8}{8}$

Step 17.2.5

Multiply $\frac{6}{1}$ by $\frac{8}{8}$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{4 \cdot 2} + \frac{6 \cdot 8}{8}$

Step 17.2.6

Reorder the factors of $4 \cdot 2$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{2 \cdot 4} + \frac{6 \cdot 8}{8}$

Step 17.2.7

Multiply $2$ by $4$ .

$\frac{3 (33 - 3 \sqrt{57})}{8} - \frac{15 (3 - \sqrt{57}) \cdot 2}{8} + \frac{6 \cdot 8}{8}$

Step 17.3

Combine the numerators over the common denominator.

$\frac{3 (33 - 3 \sqrt{57}) - 15 (3 - \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4

Simplify each term.

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Step 17.4.1

Apply the distributive property.

$\frac{3 \cdot 33 + 3 (- 3 \sqrt{57}) - 15 (3 - \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.2

Multiply $3$ by $33$ .

$\frac{99 + 3 (- 3 \sqrt{57}) - 15 (3 - \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.3

Multiply $- 3$ by $3$ .

$\frac{99 - 9 \sqrt{57} - 15 (3 - \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.4

Apply the distributive property.

$\frac{99 - 9 \sqrt{57} + (- 15 \cdot 3 - 15 (- \sqrt{57})) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.5

Multiply $- 15$ by $3$ .

$\frac{99 - 9 \sqrt{57} + (- 45 - 15 (- \sqrt{57})) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.6

Multiply $- 1$ by $- 15$ .

$\frac{99 - 9 \sqrt{57} + (- 45 + 15 \sqrt{57}) \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.7

Apply the distributive property.

$\frac{99 - 9 \sqrt{57} - 45 \cdot 2 + 15 \sqrt{57} \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.8

Multiply $- 45$ by $2$ .

$\frac{99 - 9 \sqrt{57} - 90 + 15 \sqrt{57} \cdot 2 + 6 \cdot 8}{8}$

Step 17.4.9

Multiply $2$ by $15$ .

$\frac{99 - 9 \sqrt{57} - 90 + 30 \sqrt{57} + 6 \cdot 8}{8}$

Step 17.4.10

Multiply $6$ by $8$ .

$\frac{99 - 9 \sqrt{57} - 90 + 30 \sqrt{57} + 48}{8}$

Step 17.5

Simplify by adding terms.

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Step 17.5.1

Subtract $90$ from $99$ .

$\frac{9 - 9 \sqrt{57} + 30 \sqrt{57} + 48}{8}$

Step 17.5.2

Add $9$ and $48$ .

$\frac{57 - 9 \sqrt{57} + 30 \sqrt{57}}{8}$

Step 17.5.3

Add $- 9 \sqrt{57}$ and $30 \sqrt{57}$ .

$\frac{57 + 21 \sqrt{57}}{8}$

Step 18

$x = \frac{3 - \sqrt{57}}{8}$ is a local minimum because the value of the second derivative is positive. This is referred to as the second derivative test.

$x = \frac{3 - \sqrt{57}}{8}$ is a local minimum

Step 19

Find the y-value when $x = \frac{3 - \sqrt{57}}{8}$ .

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Step 19.1

Replace the variable $x$ with $\frac{3 - \sqrt{57}}{8}$ in the expression.

$f (\frac{3 - \sqrt{57}}{8}) = (\frac{3 - \sqrt{57}}{8}) {((\frac{3 - \sqrt{57}}{8}) - 3)}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2

Simplify the result.

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Step 19.2.1

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{8}{8}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot ({(\frac{3 - \sqrt{57}}{8} - 3 \cdot \frac{8}{8})}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1))$

Step 19.2.2

Combine fractions.

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Step 19.2.2.1

Combine $- 3$ and $\frac{8}{8}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot ({(\frac{3 - \sqrt{57}}{8} + \frac{- 3 \cdot 8}{8})}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1))$

Step 19.2.2.2

Combine the numerators over the common denominator.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot ({(\frac{3 - \sqrt{57} - 3 \cdot 8}{8})}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1))$

Step 19.2.3

Simplify the numerator.

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Step 19.2.3.1

Multiply $- 3$ by $8$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot ({(\frac{3 - \sqrt{57} - 24}{8})}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1))$

Step 19.2.3.2

Subtract $24$ from $3$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot ({(\frac{- 21 - \sqrt{57}}{8})}^{2} ((\frac{3 - \sqrt{57}}{8}) + 1))$

Step 19.2.4

Simplify the expression.

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Step 19.2.4.1

Apply the product rule to $\frac{- 21 - \sqrt{57}}{8}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{{(- 21 - \sqrt{57})}^{2}}{8^{2}} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.4.2

Raise $8$ to the power of $2$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{{(- 21 - \sqrt{57})}^{2}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.4.3

Rewrite ${(- 21 - \sqrt{57})}^{2}$ as $(- 21 - \sqrt{57}) (- 21 - \sqrt{57})$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{(- 21 - \sqrt{57}) (- 21 - \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.5

Expand $(- 21 - \sqrt{57}) (- 21 - \sqrt{57})$ using the FOIL Method.

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Step 19.2.5.1

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{- 21 (- 21 - \sqrt{57}) - \sqrt{57} (- 21 - \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.5.2

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{- 21 \cdot - 21 - 21 (- \sqrt{57}) - \sqrt{57} (- 21 - \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.5.3

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{- 21 \cdot - 21 - 21 (- \sqrt{57}) - \sqrt{57} \cdot - 21 - \sqrt{57} (- \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6

Simplify and combine like terms.

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Step 19.2.6.1

Simplify each term.

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Step 19.2.6.1.1

Multiply $- 21$ by $- 21$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 - 21 (- \sqrt{57}) - \sqrt{57} \cdot - 21 - \sqrt{57} (- \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.2

Multiply $- 1$ by $- 21$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} - \sqrt{57} \cdot - 21 - \sqrt{57} (- \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.3

Multiply $- 21$ by $- 1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} - \sqrt{57} (- \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4

Multiply $- \sqrt{57} (- \sqrt{57})$ .

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Step 19.2.6.1.4.1

Multiply $- 1$ by $- 1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 1 \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4.2

Multiply $\sqrt{57}$ by $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4.3

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4.4

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + \sqrt{57} \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + {\sqrt{57}}^{1 + 1}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.4.6

Add $1$ and $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + {\sqrt{57}}^{2}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 19.2.6.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + {(57^{\frac{1}{2}})}^{2}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 57^{\frac{1}{2} \cdot 2}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 57^{\frac{2}{2}}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5.4

Cancel the common factor of $2$ .

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Step 19.2.6.1.5.4.1

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 57^{\frac{2}{2}}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5.4.2

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 57}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.1.5.5

Evaluate the exponent.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{441 + 21 \sqrt{57} + 21 \sqrt{57} + 57}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.2

Add $441$ and $57$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{498 + 21 \sqrt{57} + 21 \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.6.3

Add $21 \sqrt{57}$ and $21 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{498 + 42 \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7

Cancel the common factor of $498 + 42 \sqrt{57}$ and $64$ .

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Step 19.2.7.1

Factor $2$ out of $498$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{2 (249) + 42 \sqrt{57}}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7.2

Factor $2$ out of $42 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{2 (249) + 2 (21 \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7.3

Factor $2$ out of $2 (249) + 2 (21 \sqrt{57})$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{2 (249 + 21 \sqrt{57})}{64} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7.4

Cancel the common factors.

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Step 19.2.7.4.1

Factor $2$ out of $64$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{2 (249 + 21 \sqrt{57})}{2 \cdot 32} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7.4.2

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{2 (249 + 21 \sqrt{57})}{2 \cdot 32} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.7.4.3

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 - \sqrt{57}}{8} \cdot \frac{249 + 21 \sqrt{57}}{32} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.8

Multiply $\frac{3 - \sqrt{57}}{8} \cdot \frac{249 + 21 \sqrt{57}}{32}$ .

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Step 19.2.8.1

Multiply $\frac{3 - \sqrt{57}}{8}$ by $\frac{249 + 21 \sqrt{57}}{32}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{(3 - \sqrt{57}) (249 + 21 \sqrt{57})}{8 \cdot 32} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.8.2

Multiply $8$ by $32$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{(3 - \sqrt{57}) (249 + 21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.9

Expand $(3 - \sqrt{57}) (249 + 21 \sqrt{57})$ using the FOIL Method.

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Step 19.2.9.1

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 (249 + 21 \sqrt{57}) - \sqrt{57} (249 + 21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.9.2

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 \cdot 249 + 3 (21 \sqrt{57}) - \sqrt{57} (249 + 21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.9.3

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{3 \cdot 249 + 3 (21 \sqrt{57}) - \sqrt{57} \cdot 249 - \sqrt{57} (21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10

Simplify and combine like terms.

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Step 19.2.10.1

Simplify each term.

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Step 19.2.10.1.1

Multiply $3$ by $249$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 3 (21 \sqrt{57}) - \sqrt{57} \cdot 249 - \sqrt{57} (21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.2

Multiply $21$ by $3$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - \sqrt{57} \cdot 249 - \sqrt{57} (21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.3

Multiply $249$ by $- 1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - \sqrt{57} (21 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.4

Multiply $- \sqrt{57} (21 \sqrt{57})$ .

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Step 19.2.10.1.4.1

Multiply $21$ by $- 1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \sqrt{57} \sqrt{57}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.4.2

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 (\sqrt{57} \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.4.3

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 (\sqrt{57} \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 {\sqrt{57}}^{1 + 1}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.4.5

Add $1$ and $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 {\sqrt{57}}^{2}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 19.2.10.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 {(57^{\frac{1}{2}})}^{2}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \cdot 57^{\frac{1}{2} \cdot 2}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \cdot 57^{\frac{2}{2}}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5.4

Cancel the common factor of $2$ .

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Step 19.2.10.1.5.4.1

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \cdot 57^{\frac{2}{2}}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5.4.2

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \cdot 57}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.5.5

Evaluate the exponent.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 21 \cdot 57}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.1.6

Multiply $- 21$ by $57$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{747 + 63 \sqrt{57} - 249 \sqrt{57} - 1197}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.2

Subtract $1197$ from $747$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 450 + 63 \sqrt{57} - 249 \sqrt{57}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.10.3

Subtract $249 \sqrt{57}$ from $63 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 450 - 186 \sqrt{57}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11

Cancel the common factor of $- 450 - 186 \sqrt{57}$ and $256$ .

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Step 19.2.11.1

Factor $2$ out of $- 450$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (- 225) - 186 \sqrt{57}}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11.2

Factor $2$ out of $- 186 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (- 225) + 2 (- 93 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11.3

Factor $2$ out of $2 (- 225) + 2 (- 93 \sqrt{57})$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (- 225 - 93 \sqrt{57})}{256} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11.4

Cancel the common factors.

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Step 19.2.11.4.1

Factor $2$ out of $256$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (- 225 - 93 \sqrt{57})}{2 \cdot 128} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11.4.2

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (- 225 - 93 \sqrt{57})}{2 \cdot 128} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.11.4.3

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 - 93 \sqrt{57}}{128} \cdot ((\frac{3 - \sqrt{57}}{8}) + 1)$

Step 19.2.12

Simplify the expression.

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Step 19.2.12.1

Write $1$ as a fraction with a common denominator.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 - 93 \sqrt{57}}{128} \cdot (\frac{3 - \sqrt{57}}{8} + \frac{8}{8})$

Step 19.2.12.2

Combine the numerators over the common denominator.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 - 93 \sqrt{57}}{128} \cdot \frac{3 - \sqrt{57} + 8}{8}$

Step 19.2.12.3

Add $3$ and $8$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 - 93 \sqrt{57}}{128} \cdot \frac{11 - \sqrt{57}}{8}$

Step 19.2.13

Multiply $\frac{- 225 - 93 \sqrt{57}}{128} \cdot \frac{11 - \sqrt{57}}{8}$ .

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Step 19.2.13.1

Multiply $\frac{- 225 - 93 \sqrt{57}}{128}$ by $\frac{11 - \sqrt{57}}{8}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{(- 225 - 93 \sqrt{57}) (11 - \sqrt{57})}{128 \cdot 8}$

Step 19.2.13.2

Multiply $128$ by $8$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{(- 225 - 93 \sqrt{57}) (11 - \sqrt{57})}{1024}$

Step 19.2.14

Expand $(- 225 - 93 \sqrt{57}) (11 - \sqrt{57})$ using the FOIL Method.

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Step 19.2.14.1

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 (11 - \sqrt{57}) - 93 \sqrt{57} (11 - \sqrt{57})}{1024}$

Step 19.2.14.2

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 \cdot 11 - 225 (- \sqrt{57}) - 93 \sqrt{57} (11 - \sqrt{57})}{1024}$

Step 19.2.14.3

Apply the distributive property.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 225 \cdot 11 - 225 (- \sqrt{57}) - 93 \sqrt{57} \cdot 11 - 93 \sqrt{57} (- \sqrt{57})}{1024}$

Step 19.2.15

Simplify and combine like terms.

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Step 19.2.15.1

Simplify each term.

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Step 19.2.15.1.1

Multiply $- 225$ by $11$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 - 225 (- \sqrt{57}) - 93 \sqrt{57} \cdot 11 - 93 \sqrt{57} (- \sqrt{57})}{1024}$

Step 19.2.15.1.2

Multiply $- 1$ by $- 225$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 93 \sqrt{57} \cdot 11 - 93 \sqrt{57} (- \sqrt{57})}{1024}$

Step 19.2.15.1.3

Multiply $11$ by $- 93$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} - 93 \sqrt{57} (- \sqrt{57})}{1024}$

Step 19.2.15.1.4

Multiply $- 93 \sqrt{57} (- \sqrt{57})$ .

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Step 19.2.15.1.4.1

Multiply $- 1$ by $- 93$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \sqrt{57} \sqrt{57}}{1024}$

Step 19.2.15.1.4.2

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 (\sqrt{57} \sqrt{57})}{1024}$

Step 19.2.15.1.4.3

Raise $\sqrt{57}$ to the power of $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 (\sqrt{57} \sqrt{57})}{1024}$

Step 19.2.15.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 {\sqrt{57}}^{1 + 1}}{1024}$

Step 19.2.15.1.4.5

Add $1$ and $1$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 {\sqrt{57}}^{2}}{1024}$

Step 19.2.15.1.5

Rewrite ${\sqrt{57}}^{2}$ as $57$ .

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Step 19.2.15.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{57}$ as $57^{\frac{1}{2}}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 {(57^{\frac{1}{2}})}^{2}}{1024}$

Step 19.2.15.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \cdot 57^{\frac{1}{2} \cdot 2}}{1024}$

Step 19.2.15.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \cdot 57^{\frac{2}{2}}}{1024}$

Step 19.2.15.1.5.4

Cancel the common factor of $2$ .

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Step 19.2.15.1.5.4.1

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \cdot 57^{\frac{2}{2}}}{1024}$

Step 19.2.15.1.5.4.2

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \cdot 57}{1024}$

Step 19.2.15.1.5.5

Evaluate the exponent.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 93 \cdot 57}{1024}$

Step 19.2.15.1.6

Multiply $93$ by $57$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{- 2475 + 225 \sqrt{57} - 1023 \sqrt{57} + 5301}{1024}$

Step 19.2.15.2

Add $- 2475$ and $5301$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2826 + 225 \sqrt{57} - 1023 \sqrt{57}}{1024}$

Step 19.2.15.3

Subtract $1023 \sqrt{57}$ from $225 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2826 - 798 \sqrt{57}}{1024}$

Step 19.2.16

Cancel the common factor of $2826 - 798 \sqrt{57}$ and $1024$ .

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Step 19.2.16.1

Factor $2$ out of $2826$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (1413) - 798 \sqrt{57}}{1024}$

Step 19.2.16.2

Factor $2$ out of $- 798 \sqrt{57}$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (1413) + 2 (- 399 \sqrt{57})}{1024}$

Step 19.2.16.3

Factor $2$ out of $2 (1413) + 2 (- 399 \sqrt{57})$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (1413 - 399 \sqrt{57})}{1024}$

Step 19.2.16.4

Cancel the common factors.

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Step 19.2.16.4.1

Factor $2$ out of $1024$ .

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (1413 - 399 \sqrt{57})}{2 \cdot 512}$

Step 19.2.16.4.2

Cancel the common factor.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{2 (1413 - 399 \sqrt{57})}{2 \cdot 512}$

Step 19.2.16.4.3

Rewrite the expression.

$f (\frac{3 - \sqrt{57}}{8}) = \frac{1413 - 399 \sqrt{57}}{512}$

Step 19.2.17

The final answer is $\frac{1413 - 399 \sqrt{57}}{512}$ .

$y = \frac{1413 - 399 \sqrt{57}}{512}$

Step 20

These are the local extrema for $f (x) = x {(x - 3)}^{2} (x + 1)$ .

$(3, 0)$ is a local minima

$(\frac{3 + \sqrt{57}}{8}, \frac{1413 + 399 \sqrt{57}}{512})$ is a local maxima

$(\frac{3 - \sqrt{57}}{8}, \frac{1413 - 399 \sqrt{57}}{512})$ is a local minima

Step 21