Calculus Examples

$f (x) = \frac{x^{2} - 7 x + 26}{x - 5}$

Step 1

Find the second derivative.

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Step 1.1

Find the first derivative.

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Step 1.1.1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x^{2} - 7 x + 26$ and $g (x) = x - 5$ .

$f' (x) = \frac{(x - 5) \frac{d}{d x} (x^{2} - 7 x + 26) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2

Differentiate.

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Step 1.1.2.1

By the Sum Rule, the derivative of $x^{2} - 7 x + 26$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 7 x] + \frac{d}{d x} [26]$ .

$f' (x) = \frac{(x - 5) (\frac{d}{d x} (x^{2}) + \frac{d}{d x} (- 7 x) + \frac{d}{d x} (26)) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.2

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

$f' (x) = \frac{(x - 5) (2 x + \frac{d}{d x} (- 7 x) + \frac{d}{d x} (26)) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.3

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7 x$ with respect to $x$ is $- 7 \frac{d}{d x} [x]$ .

$f' (x) = \frac{(x - 5) (2 x - 7 \frac{d}{d x} x + \frac{d}{d x} (26)) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.4

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

$f' (x) = \frac{(x - 5) (2 x - 7 \cdot 1 + \frac{d}{d x} (26)) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.5

Multiply $- 7$ by $1$ .

$f' (x) = \frac{(x - 5) (2 x - 7 + \frac{d}{d x} (26)) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.6

Since $26$ is constant with respect to $x$ , the derivative of $26$ with respect to $x$ is $0$ .

$f' (x) = \frac{(x - 5) (2 x - 7 + 0) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.7

Add $2 x - 7$ and $0$ .

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26) \frac{d}{d x} (x - 5)}{{(x - 5)}^{2}}$

Step 1.1.2.8

By the Sum Rule, the derivative of $x - 5$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [- 5]$ .

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26) (\frac{d}{d x} (x) + \frac{d}{d x} (- 5))}{{(x - 5)}^{2}}$

Step 1.1.2.9

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

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26) (1 + \frac{d}{d x} (- 5))}{{(x - 5)}^{2}}$

Step 1.1.2.10

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5$ with respect to $x$ is $0$ .

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26) (1 + 0)}{{(x - 5)}^{2}}$

Step 1.1.2.11

Simplify the expression.

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Step 1.1.2.11.1

Add $1$ and $0$ .

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26) \cdot 1}{{(x - 5)}^{2}}$

Step 1.1.2.11.2

Multiply $- 1$ by $1$ .

$f' (x) = \frac{(x - 5) (2 x - 7) - (x^{2} - 7 x + 26)}{{(x - 5)}^{2}}$

Step 1.1.3

Simplify.

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Step 1.1.3.1

Apply the distributive property.

$f' (x) = \frac{(x - 5) (2 x - 7) - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2

Simplify the numerator.

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Step 1.1.3.2.1

Simplify each term.

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Step 1.1.3.2.1.1

Expand $(x - 5) (2 x - 7)$ using the FOIL Method.

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Step 1.1.3.2.1.1.1

Apply the distributive property.

$f' (x) = \frac{x (2 x - 7) - 5 (2 x - 7) - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.1.2

Apply the distributive property.

$f' (x) = \frac{x (2 x) + x \cdot - 7 - 5 (2 x - 7) - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.1.3

Apply the distributive property.

$f' (x) = \frac{x (2 x) + x \cdot - 7 - 5 (2 x) - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2

Simplify and combine like terms.

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Step 1.1.3.2.1.2.1

Simplify each term.

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Step 1.1.3.2.1.2.1.1

Rewrite using the commutative property of multiplication.

$f' (x) = \frac{2 x \cdot x + x \cdot - 7 - 5 (2 x) - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.1.2

Multiply $x$ by $x$ by adding the exponents.

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Step 1.1.3.2.1.2.1.2.1

Move $x$ .

$f' (x) = \frac{2 (x \cdot x) + x \cdot - 7 - 5 (2 x) - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.1.2.2

Multiply $x$ by $x$ .

$f' (x) = \frac{2 x^{2} + x \cdot - 7 - 5 (2 x) - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.1.3

Move $- 7$ to the left of $x$ .

$f' (x) = \frac{2 x^{2} - 7 \cdot x - 5 (2 x) - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.1.4

Multiply $2$ by $- 5$ .

$f' (x) = \frac{2 x^{2} - 7 x - 10 x - 5 \cdot - 7 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.1.5

Multiply $- 5$ by $- 7$ .

$f' (x) = \frac{2 x^{2} - 7 x - 10 x + 35 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.2.2

Subtract $10 x$ from $- 7 x$ .

$f' (x) = \frac{2 x^{2} - 17 x + 35 - x^{2} - (- 7 x) - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.3

Multiply $- 7$ by $- 1$ .

$f' (x) = \frac{2 x^{2} - 17 x + 35 - x^{2} + 7 x - 1 \cdot 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.1.4

Multiply $- 1$ by $26$ .

$f' (x) = \frac{2 x^{2} - 17 x + 35 - x^{2} + 7 x - 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.2

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

$f' (x) = \frac{x^{2} - 17 x + 35 + 7 x - 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.3

Add $- 17 x$ and $7 x$ .

$f' (x) = \frac{x^{2} - 10 x + 35 - 26}{{(x - 5)}^{2}}$

Step 1.1.3.2.4

Subtract $26$ from $35$ .

$f' (x) = \frac{x^{2} - 10 x + 9}{{(x - 5)}^{2}}$

Step 1.1.3.3

Factor $x^{2} - 10 x + 9$ using the AC method.

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Step 1.1.3.3.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $9$ and whose sum is $- 10$ .

$- 9, - 1$

Step 1.1.3.3.2

Write the factored form using these integers.

$f' (x) = \frac{(x - 9) (x - 1)}{{(x - 5)}^{2}}$

Step 1.2

Find the second derivative.

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Step 1.2.1

$f'' (x) = \frac{{(x - 5)}^{2} \frac{d}{d x} ((x - 9) (x - 1)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{({(x - 5)}^{2})}^{2}}$

Step 1.2.2

Multiply the exponents in ${({(x - 5)}^{2})}^{2}$ .

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Step 1.2.2.1

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

$f'' (x) = \frac{{(x - 5)}^{2} \frac{d}{d x} ((x - 9) (x - 1)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{2 \cdot 2}}$

Step 1.2.2.2

Multiply $2$ by $2$ .

$f'' (x) = \frac{{(x - 5)}^{2} \frac{d}{d x} ((x - 9) (x - 1)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.3

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 $f (x) = x - 9$ and $g (x) = x - 1$ .

$f'' (x) = \frac{{(x - 5)}^{2} ((x - 9) \frac{d}{d x} (x - 1) + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4

Differentiate.

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Step 1.2.4.1

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

$f'' (x) = \frac{{(x - 5)}^{2} ((x - 9) (\frac{d}{d x} (x) + \frac{d}{d x} (- 1)) + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.2

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

$f'' (x) = \frac{{(x - 5)}^{2} ((x - 9) (1 + \frac{d}{d x} (- 1)) + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.3

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

$f'' (x) = \frac{{(x - 5)}^{2} ((x - 9) (1 + 0) + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.4

Simplify the expression.

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Step 1.2.4.4.1

Add $1$ and $0$ .

$f'' (x) = \frac{{(x - 5)}^{2} ((x - 9) \cdot 1 + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.4.2

Multiply $x - 9$ by $1$ .

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + (x - 1) \frac{d}{d x} (x - 9)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.5

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

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + (x - 1) (\frac{d}{d x} (x) + \frac{d}{d x} (- 9))) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.6

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

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + (x - 1) (1 + \frac{d}{d x} (- 9))) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.7

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

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + (x - 1) (1 + 0)) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.8

Simplify by adding terms.

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Step 1.2.4.8.1

Add $1$ and $0$ .

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + (x - 1) \cdot 1) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.8.2

Multiply $x - 1$ by $1$ .

$f'' (x) = \frac{{(x - 5)}^{2} (x - 9 + x - 1) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.8.3

Add $x$ and $x$ .

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 9 - 1) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.4.8.4

Subtract $1$ from $- 9$ .

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 10) - (x - 9) (x - 1) \frac{d}{d x} {(x - 5)}^{2}}{{(x - 5)}^{4}}$

Step 1.2.5

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = x - 5$ .

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Step 1.2.5.1

To apply the Chain Rule, set $u$ as $x - 5$ .

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 10) - (x - 9) (x - 1) (\frac{d}{d u} (u^{2}) \frac{d}{d x} (x - 5))}{{(x - 5)}^{4}}$

Step 1.2.5.2

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

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 10) - (x - 9) (x - 1) (2 u \frac{d}{d x} (x - 5))}{{(x - 5)}^{4}}$

Step 1.2.5.3

Replace all occurrences of $u$ with $x - 5$ .

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 10) - (x - 9) (x - 1) (2 (x - 5) \frac{d}{d x} (x - 5))}{{(x - 5)}^{4}}$

Step 1.2.6

Simplify with factoring out.

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Step 1.2.6.1

Multiply $2$ by $- 1$ .

$f'' (x) = \frac{{(x - 5)}^{2} (2 x - 10) - 2 (x - 9) (x - 1) ((x - 5) \frac{d}{d x} (x - 5))}{{(x - 5)}^{4}}$

Step 1.2.6.2

Factor $x - 5$ out of ${(x - 5)}^{2} (2 x - 10) - 2 (x - 9) (x - 1) ((x - 5) \frac{d}{d x} [x - 5])$ .

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Step 1.2.6.2.1

Factor $x - 5$ out of ${(x - 5)}^{2} (2 x - 10)$ .

$f'' (x) = \frac{(x - 5) ((x - 5) (2 x - 10)) - 2 (x - 9) (x - 1) ((x - 5) \frac{d}{d x} (x - 5))}{{(x - 5)}^{4}}$

Step 1.2.6.2.2

Factor $x - 5$ out of $- 2 (x - 9) (x - 1) ((x - 5) \frac{d}{d x} [x - 5])$ .

$f'' (x) = \frac{(x - 5) ((x - 5) (2 x - 10)) + (x - 5) (- 2 (x - 9) (x - 1) (\frac{d}{d x} (x - 5)))}{{(x - 5)}^{4}}$

Step 1.2.6.2.3

Factor $x - 5$ out of $(x - 5) ((x - 5) (2 x - 10)) + (x - 5) (- 2 (x - 9) (x - 1) (\frac{d}{d x} [x - 5]))$ .

$f'' (x) = \frac{(x - 5) ((x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (\frac{d}{d x} (x - 5)))}{{(x - 5)}^{4}}$

Step 1.2.7

Cancel the common factors.

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Step 1.2.7.1

Factor $x - 5$ out of ${(x - 5)}^{4}$ .

$f'' (x) = \frac{(x - 5) ((x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (\frac{d}{d x} (x - 5)))}{(x - 5) {(x - 5)}^{3}}$

Step 1.2.7.2

Cancel the common factor.

$f'' (x) = \frac{(x - 5) ((x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (\frac{d}{d x} (x - 5)))}{(x - 5) {(x - 5)}^{3}}$

Step 1.2.7.3

Rewrite the expression.

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (\frac{d}{d x} (x - 5))}{{(x - 5)}^{3}}$

Step 1.2.8

By the Sum Rule, the derivative of $x - 5$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [- 5]$ .

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (\frac{d}{d x} (x) + \frac{d}{d x} (- 5))}{{(x - 5)}^{3}}$

Step 1.2.9

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

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (1 + \frac{d}{d x} (- 5))}{{(x - 5)}^{3}}$

Step 1.2.10

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5$ with respect to $x$ is $0$ .

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1) (1 + 0)}{{(x - 5)}^{3}}$

Step 1.2.11

Simplify the expression.

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Step 1.2.11.1

Add $1$ and $0$ .

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1) \cdot 1}{{(x - 5)}^{3}}$

Step 1.2.11.2

Multiply $- 2$ by $1$ .

$f'' (x) = \frac{(x - 5) (2 x - 10) - 2 (x - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12

Simplify.

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Step 1.2.12.1

Apply the distributive property.

$f'' (x) = \frac{(x - 5) (2 x - 10) + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2

Simplify the numerator.

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Step 1.2.12.2.1

Simplify each term.

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Step 1.2.12.2.1.1

Expand $(x - 5) (2 x - 10)$ using the FOIL Method.

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Step 1.2.12.2.1.1.1

Apply the distributive property.

$f'' (x) = \frac{x (2 x - 10) - 5 (2 x - 10) + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.1.2

Apply the distributive property.

$f'' (x) = \frac{x (2 x) + x \cdot - 10 - 5 (2 x - 10) + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.1.3

Apply the distributive property.

$f'' (x) = \frac{x (2 x) + x \cdot - 10 - 5 (2 x) - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2

Simplify and combine like terms.

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Step 1.2.12.2.1.2.1

Simplify each term.

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Step 1.2.12.2.1.2.1.1

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{2 x \cdot x + x \cdot - 10 - 5 (2 x) - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.1.2

Multiply $x$ by $x$ by adding the exponents.

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Step 1.2.12.2.1.2.1.2.1

Move $x$ .

$f'' (x) = \frac{2 (x \cdot x) + x \cdot - 10 - 5 (2 x) - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.1.2.2

Multiply $x$ by $x$ .

$f'' (x) = \frac{2 x^{2} + x \cdot - 10 - 5 (2 x) - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.1.3

Move $- 10$ to the left of $x$ .

$f'' (x) = \frac{2 x^{2} - 10 \cdot x - 5 (2 x) - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.1.4

Multiply $2$ by $- 5$ .

$f'' (x) = \frac{2 x^{2} - 10 x - 10 x - 5 \cdot - 10 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.1.5

Multiply $- 5$ by $- 10$ .

$f'' (x) = \frac{2 x^{2} - 10 x - 10 x + 50 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.2.2

Subtract $10 x$ from $- 10 x$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 + (- 2 x - 2 \cdot - 9) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.3

Multiply $- 2$ by $- 9$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 + (- 2 x + 18) (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.4

Expand $(- 2 x + 18) (x - 1)$ using the FOIL Method.

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Step 1.2.12.2.1.4.1

Apply the distributive property.

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x (x - 1) + 18 (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.4.2

Apply the distributive property.

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x \cdot x - 2 x \cdot - 1 + 18 (x - 1)}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.4.3

Apply the distributive property.

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x \cdot x - 2 x \cdot - 1 + 18 x + 18 \cdot - 1}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.5

Simplify and combine like terms.

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Step 1.2.12.2.1.5.1

Simplify each term.

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Step 1.2.12.2.1.5.1.1

Multiply $x$ by $x$ by adding the exponents.

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Step 1.2.12.2.1.5.1.1.1

Move $x$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 (x \cdot x) - 2 x \cdot - 1 + 18 x + 18 \cdot - 1}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.5.1.1.2

Multiply $x$ by $x$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x^{2} - 2 x \cdot - 1 + 18 x + 18 \cdot - 1}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.5.1.2

Multiply $- 1$ by $- 2$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x^{2} + 2 x + 18 x + 18 \cdot - 1}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.5.1.3

Multiply $18$ by $- 1$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x^{2} + 2 x + 18 x - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.1.5.2

Add $2 x$ and $18 x$ .

$f'' (x) = \frac{2 x^{2} - 20 x + 50 - 2 x^{2} + 20 x - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.2

Combine the opposite terms in $2 x^{2} - 20 x + 50 - 2 x^{2} + 20 x - 18$ .

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Step 1.2.12.2.2.1

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

$f'' (x) = \frac{- 20 x + 50 + 0 + 20 x - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.2.2

Add $- 20 x + 50$ and $0$ .

$f'' (x) = \frac{- 20 x + 50 + 20 x - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.2.3

Add $- 20 x$ and $20 x$ .

$f'' (x) = \frac{0 + 50 - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.2.4

Add $0$ and $50$ .

$f'' (x) = \frac{50 - 18}{{(x - 5)}^{3}}$

Step 1.2.12.2.3

Subtract $18$ from $50$ .

$f'' (x) = \frac{32}{{(x - 5)}^{3}}$

Step 1.3

The second derivative of $f (x)$ with respect to $x$ is $\frac{32}{{(x - 5)}^{3}}$ .

$\frac{32}{{(x - 5)}^{3}}$

Step 2

Set the second derivative equal to $0$ then solve the equation $\frac{32}{{(x - 5)}^{3}} = 0$ .

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Step 2.1

Set the second derivative equal to $0$ .

$\frac{32}{{(x - 5)}^{3}} = 0$

Step 2.2

Set the numerator equal to zero.

$32 = 0$

Step 2.3

Since $32 \neq 0$ , there are no solutions.

No solution

Step 3

No values found that can make the second derivative equal to $0$ .

No Inflection Points