Calculus Examples

$\frac{x^{2}}{x^{2} + 3}$

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 $f (x) = x^{2}$ and $g (x) = x^{2} + 3$ .

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

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 $n = 2$ .

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

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

Step 2.5

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

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

Step 2.6

Simplify the expression.

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Step 2.6.1

Add $2 x$ and $0$ .

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

Step 2.6.2

Multiply $2$ by $- 1$ .

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

Step 3

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

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

Step 4

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

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

Step 5

Add $1$ and $2$ .

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

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

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

Step 6.2

Apply the distributive property.

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

Step 6.3

Simplify the numerator.

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Step 6.3.1

Simplify each term.

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Step 6.3.1.1

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

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Step 6.3.1.1.1

Move $x$ .

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

Step 6.3.1.1.2

Multiply $x$ by $x^{2}$ .

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Step 6.3.1.1.2.1

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

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

Step 6.3.1.1.2.2

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

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

Step 6.3.1.1.3

Add $1$ and $2$ .

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

Step 6.3.1.2

Multiply $2$ by $3$ .

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

Step 6.3.2

Combine the opposite terms in $2 x^{3} + 6 x - 2 x^{3}$ .

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Step 6.3.2.1

Subtract $2 x^{3}$ from $2 x^{3}$ .

$\frac{6 x + 0}{{(x^{2} + 3)}^{2}}$

Step 6.3.2.2

Add $6 x$ and $0$ .

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