Calculus Examples

$y = \frac{{(x^{3} + 4)}^{5}}{3 x^{4} - 2}$

Step 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 $f (x) = {(x^{3} + 4)}^{5}$ and $g (x) = 3 x^{4} - 2$ .

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

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{5}$ and $g (x) = x^{3} + 4$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $x^{3} + 4$ .

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

Step 2.2

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

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

Step 2.3

Replace all occurrences of $u$ with $x^{3} + 4$ .

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

Step 3

Differentiate.

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Step 3.1

Move $5$ to the left of $3 x^{4} - 2$ .

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

Step 3.2

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

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

Step 3.3

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

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

Step 3.4

Since $4$ is constant with respect to $x$ , the derivative of $4$ with respect to $x$ is $0$ .

$\frac{5 (3 x^{4} - 2) {(x^{3} + 4)}^{4} (3 x^{2} + 0) - {(x^{3} + 4)}^{5} \frac{d}{d x} [3 x^{4} - 2]}{{(3 x^{4} - 2)}^{2}}$

Step 3.5

Simplify the expression.

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Step 3.5.1

Add $3 x^{2}$ and $0$ .

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

Step 3.5.2

Multiply $3$ by $5$ .

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

Step 3.6

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

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

Step 3.7

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

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

Step 3.8

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

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

Step 3.9

Multiply $4$ by $3$ .

$\frac{15 (3 x^{4} - 2) {(x^{3} + 4)}^{4} x^{2} - {(x^{3} + 4)}^{5} (12 x^{3} + \frac{d}{d x} [- 2])}{{(3 x^{4} - 2)}^{2}}$

Step 3.10

Since $- 2$ is constant with respect to $x$ , the derivative of $- 2$ with respect to $x$ is $0$ .

$\frac{15 (3 x^{4} - 2) {(x^{3} + 4)}^{4} x^{2} - {(x^{3} + 4)}^{5} (12 x^{3} + 0)}{{(3 x^{4} - 2)}^{2}}$

Step 3.11

Simplify the expression.

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Step 3.11.1

Add $12 x^{3}$ and $0$ .

$\frac{15 (3 x^{4} - 2) {(x^{3} + 4)}^{4} x^{2} - {(x^{3} + 4)}^{5} (12 x^{3})}{{(3 x^{4} - 2)}^{2}}$

Step 3.11.2

Multiply $12$ by $- 1$ .

$\frac{15 (3 x^{4} - 2) {(x^{3} + 4)}^{4} x^{2} - 12 {(x^{3} + 4)}^{5} x^{3}}{{(3 x^{4} - 2)}^{2}}$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$\frac{(15 (3 x^{4}) + 15 \cdot - 2) {(x^{3} + 4)}^{4} x^{2} - 12 {(x^{3} + 4)}^{5} x^{3}}{{(3 x^{4} - 2)}^{2}}$

Step 4.2

Simplify the numerator.

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Step 4.2.1

Factor ${(x^{3} + 4)}^{4} x^{2}$ out of $(15 \cdot 3 x^{4} + 15 \cdot - 2) {(x^{3} + 4)}^{4} x^{2} - 12 {(x^{3} + 4)}^{5} x^{3}$ .

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Step 4.2.1.1

Factor ${(x^{3} + 4)}^{4} x^{2}$ out of $(15 \cdot 3 x^{4} + 15 \cdot - 2) {(x^{3} + 4)}^{4} x^{2}$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (15 \cdot 3 x^{4} + 15 \cdot - 2) - 12 {(x^{3} + 4)}^{5} x^{3}}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.1.2

Factor ${(x^{3} + 4)}^{4} x^{2}$ out of $- 12 {(x^{3} + 4)}^{5} x^{3}$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (15 \cdot 3 x^{4} + 15 \cdot - 2) + {(x^{3} + 4)}^{4} x^{2} (- 12 (x^{3} + 4) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.1.3

Factor ${(x^{3} + 4)}^{4} x^{2}$ out of ${(x^{3} + 4)}^{4} x^{2} (15 \cdot 3 x^{4} + 15 \cdot - 2) + {(x^{3} + 4)}^{4} x^{2} (- 12 (x^{3} + 4) x)$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (15 \cdot 3 x^{4} + 15 \cdot - 2 - 12 (x^{3} + 4) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.2

Combine exponents.

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Step 4.2.2.1

Multiply $15$ by $3$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} + 15 \cdot - 2 - 12 (x^{3} + 4) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.2.2

Multiply $15$ by $- 2$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 (x^{3} + 4) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3

Simplify each term.

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Step 4.2.3.1

Apply the distributive property.

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 + (- 12 x^{3} - 12 \cdot 4) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.2

Multiply $- 12$ by $4$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 + (- 12 x^{3} - 48) x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.3

Apply the distributive property.

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 x^{3} x - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.4

Multiply $x^{3}$ by $x$ by adding the exponents.

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Step 4.2.3.4.1

Move $x$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 (x \cdot x^{3}) - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.4.2

Multiply $x$ by $x^{3}$ .

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Step 4.2.3.4.2.1

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

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 (x^{1} x^{3}) - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.4.2.2

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

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 x^{1 + 3} - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.3.4.3

Add $1$ and $3$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (45 x^{4} - 30 - 12 x^{4} - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.4

Subtract $12 x^{4}$ from $45 x^{4}$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (33 x^{4} - 30 - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.5

Factor $3$ out of $33 x^{4} - 30 - 48 x$ .

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Step 4.2.5.1

Factor $3$ out of $33 x^{4}$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (3 (11 x^{4}) - 30 - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.5.2

Factor $3$ out of $- 30$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (3 (11 x^{4}) + 3 (- 10) - 48 x)}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.5.3

Factor $3$ out of $- 48 x$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (3 (11 x^{4}) + 3 (- 10) + 3 (- 16 x))}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.5.4

Factor $3$ out of $3 (11 x^{4}) + 3 (- 10)$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (3 (11 x^{4} - 10) + 3 (- 16 x))}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.5.5

Factor $3$ out of $3 (11 x^{4} - 10) + 3 (- 16 x)$ .

$\frac{{(x^{3} + 4)}^{4} x^{2} (3 (11 x^{4} - 10 - 16 x))}{{(3 x^{4} - 2)}^{2}}$

Step 4.2.6

Reorder terms.

$\frac{{(x^{3} + 4)}^{4} x^{2} \cdot 3 (11 x^{4} - 16 x - 10)}{{(3 x^{4} - 2)}^{2}}$

Step 4.3

Move $3$ to the left of ${(x^{3} + 4)}^{4} x^{2}$ .

$\frac{3 {(x^{3} + 4)}^{4} x^{2} (11 x^{4} - 16 x - 10)}{{(3 x^{4} - 2)}^{2}}$

Step 4.4

Reorder terms.

$\frac{3 x^{2} {(x^{3} + 4)}^{4} (11 x^{4} - 16 x - 10)}{{(3 x^{4} - 2)}^{2}}$