Calculus Examples

$\frac{x^{3}}{5 + x^{3}}$

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 $f (x) = x^{3}$ and $g (x) = 5 + x^{3}$ .

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

Move $3$ to the left of $5 + x^{3}$ .

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

Step 2.3

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

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

Step 2.4

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

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

Step 2.5

Add $0$ and $\frac{d}{d x} [x^{3}]$ .

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

Step 2.6

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

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

Step 2.7

Multiply $3$ by $- 1$ .

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

Step 3

Multiply $x^{3}$ by $x^{2}$ by adding the exponents.

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Step 3.1

Move $x^{2}$ .

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

Step 3.2

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

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

Step 3.3

Add $2$ and $3$ .

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

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

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

Step 4.2

Apply the distributive property.

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

Step 4.3

Simplify the numerator.

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Step 4.3.1

Simplify each term.

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Step 4.3.1.1

Multiply $3$ by $5$ .

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

Step 4.3.1.2

Multiply $x^{3}$ by $x^{2}$ by adding the exponents.

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Step 4.3.1.2.1

Move $x^{2}$ .

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

Step 4.3.1.2.2

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

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

Step 4.3.1.2.3

Add $2$ and $3$ .

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

Step 4.3.2

Combine the opposite terms in $15 x^{2} + 3 x^{5} - 3 x^{5}$ .

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Step 4.3.2.1

Subtract $3 x^{5}$ from $3 x^{5}$ .

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

Step 4.3.2.2

Add $15 x^{2}$ and $0$ .

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

Step 4.4

Reorder terms.

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