Calculus Examples

{(2 x^{3} + x^{2} - 6 x)}^{\frac{2}{3}}

${(2 x^{3} + x^{2} - 6 x)}^{\frac{2}{3}}$

Step 1

Differentiate using the chain rule, which states that

$\frac{d}{d x} [f (g (x))]$ is

$f' (g (x)) g' (x)$ where

$f (x) = x^{\frac{2}{3}}$ and

$g (x) = 2 x^{3} + x^{2} - 6 x$ .

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Step 1.1

To apply the Chain Rule, set

$u$ as

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

$\frac{d}{d u} [u^{\frac{2}{3}}] \frac{d}{d x} [2 x^{3} + x^{2} - 6 x]$

Step 1.2

Differentiate using the Power Rule which states that

$\frac{d}{d u} [u^{n}]$ is

$n u^{n - 1}$ where

$n = \frac{2}{3}$ .

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

Step 1.3

Replace all occurrences of

$u$ with

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

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

Step 2

To write

$- 1$ as a fraction with a common denominator, multiply by

$\frac{3}{3}$ .

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

Step 3

Combine

$- 1$ and

$\frac{3}{3}$ .

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

Step 4

Combine the numerators over the common denominator.

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

Step 5

Simplify the numerator.

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Step 5.1

Multiply

$- 1$ by

$3$ .

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

Step 5.2

Subtract

$3$ from

$2$ .

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

Step 6

Combine fractions.

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Step 6.1

Move the negative in front of the fraction.

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

Step 6.2

Combine

$\frac{2}{3}$ and

${(2 x^{3} + x^{2} - 6 x)}^{- \frac{1}{3}}$ .

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

Step 6.3

Move

${(2 x^{3} + x^{2} - 6 x)}^{- \frac{1}{3}}$ to the denominator using the negative exponent rule

$b^{- n} = \frac{1}{b^{n}}$ .

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

Step 7

By the Sum Rule, the derivative of

$2 x^{3} + x^{2} - 6 x$ with respect to

$x$ is

$\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 6 x]$ .

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

Step 8

Since

$2$ is constant with respect to

$x$ , the derivative of

$2 x^{3}$ with respect to

$x$ is

$2 \frac{d}{d x} [x^{3}]$ .

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

Step 9

Differentiate using the Power Rule which states that

$\frac{d}{d x} [x^{n}]$ is

$n x^{n - 1}$ where

$n = 3$ .

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

Step 10

Multiply

$3$ by

$2$ .

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

Step 11

Differentiate using the Power Rule which states that

$\frac{d}{d x} [x^{n}]$ is

$n x^{n - 1}$ where

$n = 2$ .

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

Step 12

Since

$- 6$ is constant with respect to

$x$ , the derivative of

$- 6 x$ with respect to

$x$ is

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

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

Step 13

Differentiate using the Power Rule which states that

$\frac{d}{d x} [x^{n}]$ is

$n x^{n - 1}$ where

$n = 1$ .

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

Step 14

Multiply

$- 6$ by

$1$ .

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

Step 15

Simplify.

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Step 15.1

Reorder the factors of

$\frac{2}{3 {(2 x^{3} + x^{2} - 6 x)}^{\frac{1}{3}}} (6 x^{2} + 2 x - 6)$ .

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

Step 15.2

Multiply

$6 x^{2} + 2 x - 6$ by

$\frac{2}{3 {(2 x^{3} + x^{2} - 6 x)}^{\frac{1}{3}}}$ .

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

Step 15.3

Simplify the numerator.

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Step 15.3.1

Factor

$2$ out of

$6 x^{2} + 2 x - 6$ .

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Step 15.3.1.1

Factor

$2$ out of

$6 x^{2}$ .

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

Step 15.3.1.2

Factor

$2$ out of

$2 x$ .

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

Step 15.3.1.3

Factor

$2$ out of

$- 6$ .

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

Step 15.3.1.4

Factor

$2$ out of

$2 (3 x^{2}) + 2 x$ .

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

Step 15.3.1.5

Factor

$2$ out of

$2 (3 x^{2} + x) + 2 \cdot - 3$ .

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

Step 15.3.2

Multiply

$2$ by

$2$ .

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