Calculus Examples

$y = \frac{1}{3 x^{5} - 2 x}$

Step 1

Rewrite $\frac{1}{3 x^{5} - 2 x}$ as ${(3 x^{5} - 2 x)}^{- 1}$ .

$\frac{d}{d x} [{(3 x^{5} - 2 x)}^{- 1}]$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{- 1}$ and $g (x) = 3 x^{5} - 2 x$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $3 x^{5} - 2 x$ .

$\frac{d}{d u} [u^{- 1}] \frac{d}{d x} [3 x^{5} - 2 x]$

Step 2.2

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

$- u^{- 2} \frac{d}{d x} [3 x^{5} - 2 x]$

Step 2.3

Replace all occurrences of $u$ with $3 x^{5} - 2 x$ .

$- {(3 x^{5} - 2 x)}^{- 2} \frac{d}{d x} [3 x^{5} - 2 x]$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $3 x^{5} - 2 x$ with respect to $x$ is $\frac{d}{d x} [3 x^{5}] + \frac{d}{d x} [- 2 x]$ .

$- {(3 x^{5} - 2 x)}^{- 2} (\frac{d}{d x} [3 x^{5}] + \frac{d}{d x} [- 2 x])$

Step 3.2

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{5}$ with respect to $x$ is $3 \frac{d}{d x} [x^{5}]$ .

$- {(3 x^{5} - 2 x)}^{- 2} (3 \frac{d}{d x} [x^{5}] + \frac{d}{d x} [- 2 x])$

Step 3.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 5$ .

$- {(3 x^{5} - 2 x)}^{- 2} (3 (5 x^{4}) + \frac{d}{d x} [- 2 x])$

Step 3.4

Multiply $5$ by $3$ .

$- {(3 x^{5} - 2 x)}^{- 2} (15 x^{4} + \frac{d}{d x} [- 2 x])$

Step 3.5

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

$- {(3 x^{5} - 2 x)}^{- 2} (15 x^{4} - 2 \frac{d}{d x} [x])$

Step 3.6

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

$- {(3 x^{5} - 2 x)}^{- 2} (15 x^{4} - 2 \cdot 1)$

Step 3.7

Multiply $- 2$ by $1$ .

$- {(3 x^{5} - 2 x)}^{- 2} (15 x^{4} - 2)$

Step 4

Simplify.

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Step 4.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \frac{1}{{(3 x^{5} - 2 x)}^{2}} (15 x^{4} - 2)$

Step 4.2

Reorder the factors of $- \frac{1}{{(3 x^{5} - 2 x)}^{2}} (15 x^{4} - 2)$ .

$- (15 x^{4} - 2) \frac{1}{{(3 x^{5} - 2 x)}^{2}}$

Step 4.3

Apply the distributive property.

$(- (15 x^{4}) - - 2) \frac{1}{{(3 x^{5} - 2 x)}^{2}}$

Step 4.4

Multiply $15$ by $- 1$ .

$(- 15 x^{4} - - 2) \frac{1}{{(3 x^{5} - 2 x)}^{2}}$

Step 4.5

Multiply $- 1$ by $- 2$ .

$(- 15 x^{4} + 2) \frac{1}{{(3 x^{5} - 2 x)}^{2}}$

Step 4.6

Simplify the denominator.

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Step 4.6.1

Factor $x$ out of $3 x^{5} - 2 x$ .

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Step 4.6.1.1

Factor $x$ out of $3 x^{5}$ .

$(- 15 x^{4} + 2) \frac{1}{{(x (3 x^{4}) - 2 x)}^{2}}$

Step 4.6.1.2

Factor $x$ out of $- 2 x$ .

$(- 15 x^{4} + 2) \frac{1}{{(x (3 x^{4}) + x \cdot - 2)}^{2}}$

Step 4.6.1.3

Factor $x$ out of $x (3 x^{4}) + x \cdot - 2$ .

$(- 15 x^{4} + 2) \frac{1}{{(x (3 x^{4} - 2))}^{2}}$

Step 4.6.2

Apply the product rule to $x (3 x^{4} - 2)$ .

$(- 15 x^{4} + 2) \frac{1}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.7

Multiply $- 15 x^{4} + 2$ by $\frac{1}{x^{2} {(3 x^{4} - 2)}^{2}}$ .

$\frac{- 15 x^{4} + 2}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.8

Factor $- 1$ out of $- 15 x^{4}$ .

$\frac{- (15 x^{4}) + 2}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.9

Rewrite $2$ as $- 1 (- 2)$ .

$\frac{- (15 x^{4}) - 1 (- 2)}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.10

Factor $- 1$ out of $- (15 x^{4}) - 1 (- 2)$ .

$\frac{- (15 x^{4} - 2)}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.11

Rewrite $- (15 x^{4} - 2)$ as $- 1 (15 x^{4} - 2)$ .

$\frac{- 1 (15 x^{4} - 2)}{x^{2} {(3 x^{4} - 2)}^{2}}$

Step 4.12

Move the negative in front of the fraction.

$- \frac{15 x^{4} - 2}{x^{2} {(3 x^{4} - 2)}^{2}}$