Calculus Examples

$\frac{4 x^{3}}{x^{4} + 27}$

Step 1

Since $4$ is constant with respect to $x$ , the derivative of $\frac{4 x^{3}}{x^{4} + 27}$ with respect to $x$ is $4 \frac{d}{d x} [\frac{x^{3}}{x^{4} + 27}]$ .

$4 \frac{d}{d x} [\frac{x^{3}}{x^{4} + 27}]$

Step 2

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 $g (x) = x^{4} + 27$ .

$4 \frac{(x^{4} + 27) \frac{d}{d x} [x^{3}] - x^{3} \frac{d}{d x} [x^{4} + 27]}{{(x^{4} + 27)}^{2}}$

Step 3

Differentiate.

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Step 3.1

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

$4 \frac{(x^{4} + 27) (3 x^{2}) - x^{3} \frac{d}{d x} [x^{4} + 27]}{{(x^{4} + 27)}^{2}}$

Step 3.2

Move $3$ to the left of $x^{4} + 27$ .

$4 \frac{3 \cdot (x^{4} + 27) x^{2} - x^{3} \frac{d}{d x} [x^{4} + 27]}{{(x^{4} + 27)}^{2}}$

Step 3.3

By the Sum Rule, the derivative of $x^{4} + 27$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [27]$ .

$4 \frac{3 (x^{4} + 27) x^{2} - x^{3} (\frac{d}{d x} [x^{4}] + \frac{d}{d x} [27])}{{(x^{4} + 27)}^{2}}$

Step 3.4

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

$4 \frac{3 (x^{4} + 27) x^{2} - x^{3} (4 x^{3} + \frac{d}{d x} [27])}{{(x^{4} + 27)}^{2}}$

Step 3.5

Since $27$ is constant with respect to $x$ , the derivative of $27$ with respect to $x$ is $0$ .

$4 \frac{3 (x^{4} + 27) x^{2} - x^{3} (4 x^{3} + 0)}{{(x^{4} + 27)}^{2}}$

Step 3.6

Simplify the expression.

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Step 3.6.1

Add $4 x^{3}$ and $0$ .

$4 \frac{3 (x^{4} + 27) x^{2} - x^{3} (4 x^{3})}{{(x^{4} + 27)}^{2}}$

Step 3.6.2

Multiply $4$ by $- 1$ .

$4 \frac{3 (x^{4} + 27) x^{2} - 4 x^{3} x^{3}}{{(x^{4} + 27)}^{2}}$

Step 4

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

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Step 4.1

Move $x^{3}$ .

$4 \frac{3 (x^{4} + 27) x^{2} - 4 (x^{3} x^{3})}{{(x^{4} + 27)}^{2}}$

Step 4.2

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

$4 \frac{3 (x^{4} + 27) x^{2} - 4 x^{3 + 3}}{{(x^{4} + 27)}^{2}}$

Step 4.3

Add $3$ and $3$ .

$4 \frac{3 (x^{4} + 27) x^{2} - 4 x^{6}}{{(x^{4} + 27)}^{2}}$

Step 5

Combine $4$ and $\frac{3 (x^{4} + 27) x^{2} - 4 x^{6}}{{(x^{4} + 27)}^{2}}$ .

$\frac{4 (3 (x^{4} + 27) x^{2} - 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$\frac{4 ((3 x^{4} + 3 \cdot 27) x^{2} - 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.2

Apply the distributive property.

$\frac{4 (3 x^{4} x^{2} + 3 \cdot 27 x^{2} - 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.3

Apply the distributive property.

$\frac{4 (3 x^{4} x^{2}) + 4 (3 \cdot 27 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4

Simplify the numerator.

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Step 6.4.1

Simplify each term.

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Step 6.4.1.1

Multiply $x^{4}$ by $x^{2}$ by adding the exponents.

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Step 6.4.1.1.1

Move $x^{2}$ .

$\frac{4 (3 (x^{2} x^{4})) + 4 (3 \cdot 27 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.1.2

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

$\frac{4 (3 x^{2 + 4}) + 4 (3 \cdot 27 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.1.3

Add $2$ and $4$ .

$\frac{4 (3 x^{6}) + 4 (3 \cdot 27 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.2

Multiply $3$ by $4$ .

$\frac{12 x^{6} + 4 (3 \cdot 27 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.3

Multiply $3$ by $27$ .

$\frac{12 x^{6} + 4 (81 x^{2}) + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.4

Multiply $81$ by $4$ .

$\frac{12 x^{6} + 324 x^{2} + 4 (- 4 x^{6})}{{(x^{4} + 27)}^{2}}$

Step 6.4.1.5

Multiply $- 4$ by $4$ .

$\frac{12 x^{6} + 324 x^{2} - 16 x^{6}}{{(x^{4} + 27)}^{2}}$

Step 6.4.2

Subtract $16 x^{6}$ from $12 x^{6}$ .

$\frac{- 4 x^{6} + 324 x^{2}}{{(x^{4} + 27)}^{2}}$