Calculus Examples

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

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 $f (x) = 3 + 2 x^{2}$ and $g (x) = 1 - 5 x^{2}$ .

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

$\frac{(1 - 5 x^{2}) (0 + \frac{d}{d x} [2 x^{2}]) - (3 + 2 x^{2}) \frac{d}{d x} [1 - 5 x^{2}]}{{(1 - 5 x^{2})}^{2}}$

Step 2.3

Add $0$ and $\frac{d}{d x} [2 x^{2}]$ .

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

Step 2.4

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

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

Step 2.5

Move $2$ to the left of $1 - 5 x^{2}$ .

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

Step 2.6

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

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

Step 2.7

Multiply $2$ by $2$ .

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

Step 2.8

By the Sum Rule, the derivative of $1 - 5 x^{2}$ with respect to $x$ is $\frac{d}{d x} [1] + \frac{d}{d x} [- 5 x^{2}]$ .

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

Step 2.9

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$\frac{4 (1 - 5 x^{2}) x - (3 + 2 x^{2}) (0 + \frac{d}{d x} [- 5 x^{2}])}{{(1 - 5 x^{2})}^{2}}$

Step 2.10

Add $0$ and $\frac{d}{d x} [- 5 x^{2}]$ .

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

Step 2.11

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5 x^{2}$ with respect to $x$ is $- 5 \frac{d}{d x} [x^{2}]$ .

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

Step 2.12

Multiply $- 5$ by $- 1$ .

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

Step 2.13

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

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

Step 2.14

Multiply $2$ by $5$ .

$\frac{4 (1 - 5 x^{2}) x + 10 (3 + 2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3

Simplify.

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Step 3.1

Apply the distributive property.

$\frac{(4 \cdot 1 + 4 (- 5 x^{2})) x + 10 (3 + 2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.2

Apply the distributive property.

$\frac{4 \cdot 1 x + 4 (- 5 x^{2}) x + 10 (3 + 2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.3

Apply the distributive property.

$\frac{4 \cdot 1 x + 4 (- 5 x^{2}) x + (10 \cdot 3 + 10 (2 x^{2})) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.4

Apply the distributive property.

$\frac{4 \cdot 1 x + 4 (- 5 x^{2}) x + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5

Simplify the numerator.

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Step 3.5.1

Simplify each term.

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Step 3.5.1.1

Multiply $4$ by $1$ .

$\frac{4 x + 4 (- 5 x^{2}) x + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.2

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

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Step 3.5.1.2.1

Move $x$ .

$\frac{4 x + 4 (- 5 (x \cdot x^{2})) + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.2.2

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

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Step 3.5.1.2.2.1

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

$\frac{4 x + 4 (- 5 (x^{1} x^{2})) + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.2.2.2

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

$\frac{4 x + 4 (- 5 x^{1 + 2}) + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.2.3

Add $1$ and $2$ .

$\frac{4 x + 4 (- 5 x^{3}) + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.3

Multiply $- 5$ by $4$ .

$\frac{4 x - 20 x^{3} + 10 \cdot 3 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.4

Multiply $10$ by $3$ .

$\frac{4 x - 20 x^{3} + 30 x + 10 (2 x^{2}) x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.5

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

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Step 3.5.1.5.1

Move $x$ .

$\frac{4 x - 20 x^{3} + 30 x + 10 (2 (x \cdot x^{2}))}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.5.2

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

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Step 3.5.1.5.2.1

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

$\frac{4 x - 20 x^{3} + 30 x + 10 (2 (x^{1} x^{2}))}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.5.2.2

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

$\frac{4 x - 20 x^{3} + 30 x + 10 (2 x^{1 + 2})}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.5.3

Add $1$ and $2$ .

$\frac{4 x - 20 x^{3} + 30 x + 10 (2 x^{3})}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.1.6

Multiply $2$ by $10$ .

$\frac{4 x - 20 x^{3} + 30 x + 20 x^{3}}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.2

Combine the opposite terms in $4 x - 20 x^{3} + 30 x + 20 x^{3}$ .

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Step 3.5.2.1

Add $- 20 x^{3}$ and $20 x^{3}$ .

$\frac{4 x + 30 x + 0}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.2.2

Add $4 x + 30 x$ and $0$ .

$\frac{4 x + 30 x}{{(1 - 5 x^{2})}^{2}}$

Step 3.5.3

Add $4 x$ and $30 x$ .

$\frac{34 x}{{(1 - 5 x^{2})}^{2}}$

Step 3.6

Reorder terms.

$\frac{34 x}{{(- 5 x^{2} + 1)}^{2}}$