Calculus Examples

$y = - 6 x {(3 x - 1)}^{2}$

Step 1

Rewrite ${(3 x - 1)}^{2}$ as $(3 x - 1) (3 x - 1)$ .

$\frac{d}{d x} [- 6 x ((3 x - 1) (3 x - 1))]$

Step 2

Expand $(3 x - 1) (3 x - 1)$ using the FOIL Method.

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Step 2.1

Apply the distributive property.

$\frac{d}{d x} [- 6 x (3 x (3 x - 1) - 1 (3 x - 1))]$

Step 2.2

Apply the distributive property.

$\frac{d}{d x} [- 6 x (3 x (3 x) + 3 x \cdot - 1 - 1 (3 x - 1))]$

Step 2.3

Apply the distributive property.

$\frac{d}{d x} [- 6 x (3 x (3 x) + 3 x \cdot - 1 - 1 (3 x) - 1 \cdot - 1)]$

Step 3

Simplify and combine like terms.

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Step 3.1

Simplify each term.

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Step 3.1.1

Rewrite using the commutative property of multiplication.

$\frac{d}{d x} [- 6 x (3 \cdot 3 x \cdot x + 3 x \cdot - 1 - 1 (3 x) - 1 \cdot - 1)]$

Step 3.1.2

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

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Step 3.1.2.1

Move $x$ .

$\frac{d}{d x} [- 6 x (3 \cdot 3 (x \cdot x) + 3 x \cdot - 1 - 1 (3 x) - 1 \cdot - 1)]$

Step 3.1.2.2

Multiply $x$ by $x$ .

$\frac{d}{d x} [- 6 x (3 \cdot 3 x^{2} + 3 x \cdot - 1 - 1 (3 x) - 1 \cdot - 1)]$

Step 3.1.3

Multiply $3$ by $3$ .

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

Step 3.1.4

Multiply $- 1$ by $3$ .

$\frac{d}{d x} [- 6 x (9 x^{2} - 3 x - 1 (3 x) - 1 \cdot - 1)]$

Step 3.1.5

Multiply $3$ by $- 1$ .

$\frac{d}{d x} [- 6 x (9 x^{2} - 3 x - 3 x - 1 \cdot - 1)]$

Step 3.1.6

Multiply $- 1$ by $- 1$ .

$\frac{d}{d x} [- 6 x (9 x^{2} - 3 x - 3 x + 1)]$

Step 3.2

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

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

Step 4

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x (9 x^{2} - 6 x + 1)$ with respect to $x$ is $- 6 \frac{d}{d x} [x (9 x^{2} - 6 x + 1)]$ .

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

Step 5

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

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

Step 6

Differentiate.

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Step 6.1

By the Sum Rule, the derivative of $9 x^{2} - 6 x + 1$ with respect to $x$ is $\frac{d}{d x} [9 x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [1]$ .

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

Step 6.2

Since $9$ is constant with respect to $x$ , the derivative of $9 x^{2}$ with respect to $x$ is $9 \frac{d}{d x} [x^{2}]$ .

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

Step 6.3

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

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

Step 6.4

Multiply $2$ by $9$ .

$- 6 (x (18 x + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [1]) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.5

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

$- 6 (x (18 x - 6 \frac{d}{d x} [x] + \frac{d}{d x} [1]) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.6

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

$- 6 (x (18 x - 6 \cdot 1 + \frac{d}{d x} [1]) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.7

Multiply $- 6$ by $1$ .

$- 6 (x (18 x - 6 + \frac{d}{d x} [1]) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.8

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

$- 6 (x (18 x - 6 + 0) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.9

Add $18 x - 6$ and $0$ .

$- 6 (x (18 x - 6) + (9 x^{2} - 6 x + 1) \frac{d}{d x} [x])$

Step 6.10

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

$- 6 (x (18 x - 6) + (9 x^{2} - 6 x + 1) \cdot 1)$

Step 6.11

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

$- 6 (x (18 x - 6) + 9 x^{2} - 6 x + 1)$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$- 6 (x (18 x) + x \cdot - 6 + 9 x^{2} - 6 x + 1)$

Step 7.2

Apply the distributive property.

$- 6 (x (18 x)) - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3

Combine terms.

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Step 7.3.1

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

$- 6 (18 (x^{1} x)) - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.2

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

$- 6 (18 (x^{1} x^{1})) - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.3

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

$- 6 (18 x^{1 + 1}) - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.4

Add $1$ and $1$ .

$- 6 (18 x^{2}) - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.5

Multiply $18$ by $- 6$ .

$- 108 x^{2} - 6 (x \cdot - 6) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.6

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

$- 108 x^{2} - 6 (- 6 \cdot x) - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.7

Multiply $- 6$ by $- 6$ .

$- 108 x^{2} + 36 x - 6 (9 x^{2}) - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.8

Multiply $9$ by $- 6$ .

$- 108 x^{2} + 36 x - 54 x^{2} - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.9

Subtract $54 x^{2}$ from $- 108 x^{2}$ .

$- 162 x^{2} + 36 x - 6 (- 6 x) - 6 \cdot 1$

Step 7.3.10

Multiply $- 6$ by $- 6$ .

$- 162 x^{2} + 36 x + 36 x - 6 \cdot 1$

Step 7.3.11

Add $36 x$ and $36 x$ .

$- 162 x^{2} + 72 x - 6 \cdot 1$

Step 7.3.12

Multiply $- 6$ by $1$ .

$- 162 x^{2} + 72 x - 6$