Calculus Examples

$f (x) = (1 + 7 x^{2}) (x - x^{2})$

Step 1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = 1 + 7 x^{2}$ and $g (x) = x - x^{2}$ .

$(1 + 7 x^{2}) \frac{d}{d x} [x - x^{2}] + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 2

Differentiate.

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Step 2.1

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

$(1 + 7 x^{2}) (\frac{d}{d x} [x] + \frac{d}{d x} [- x^{2}]) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 2.2

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

$(1 + 7 x^{2}) (1 + \frac{d}{d x} [- x^{2}]) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 3

Evaluate $\frac{d}{d x} [- x^{2}]$ .

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Step 3.1

Since $- 1$ is constant with respect to $x$ , the derivative of $- x^{2}$ with respect to $x$ is $- \frac{d}{d x} [x^{2}]$ .

$(1 + 7 x^{2}) (1 - \frac{d}{d x} [x^{2}]) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 3.2

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

$(1 + 7 x^{2}) (1 - (2 x)) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 3.3

Multiply $2$ by $- 1$ .

$(1 + 7 x^{2}) (1 - 2 x) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 4

Differentiate.

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Step 4.1

Reorder terms.

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) \frac{d}{d x} [1 + 7 x^{2}]$

Step 4.2

By the Sum Rule, the derivative of $1 + 7 x^{2}$ with respect to $x$ is $\frac{d}{d x} [1] + \frac{d}{d x} [7 x^{2}]$ .

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (\frac{d}{d x} [1] + \frac{d}{d x} [7 x^{2}])$

Step 4.3

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

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (0 + \frac{d}{d x} [7 x^{2}])$

Step 5

Evaluate $\frac{d}{d x} [7 x^{2}]$ .

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Step 5.1

Since $7$ is constant with respect to $x$ , the derivative of $7 x^{2}$ with respect to $x$ is $7 \frac{d}{d x} [x^{2}]$ .

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (0 + 7 \frac{d}{d x} [x^{2}])$

Step 5.2

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

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (0 + 7 (2 x))$

Step 5.3

Multiply $2$ by $7$ .

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (0 + 14 x)$

Step 6

Add $0$ and $14 x$ .

$(1 + 7 x^{2}) (- 2 x + 1) + (x - x^{2}) (14 x)$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$(1 + 7 x^{2}) (- 2 x + 1) + x (14 x) - x^{2} (14 x)$

Step 7.2

Apply the distributive property.

$(1 + 7 x^{2}) (- 2 x) + (1 + 7 x^{2}) \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.3

Apply the distributive property.

$1 (- 2 x) + 7 x^{2} (- 2 x) + (1 + 7 x^{2}) \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.4

Apply the distributive property.

$1 (- 2 x) + 7 x^{2} (- 2 x) + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5

Combine terms.

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Step 7.5.1

Multiply $- 2$ by $1$ .

$- 2 x + 7 x^{2} (- 2 x) + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.2

Multiply $- 2$ by $7$ .

$- 2 x - 14 x^{2} x + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.3

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

$- 2 x - 14 (x^{1} x^{2}) + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.4

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

$- 2 x - 14 x^{1 + 2} + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.5

Add $1$ and $2$ .

$- 2 x - 14 x^{3} + 1 \cdot 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.6

Multiply $1$ by $1$ .

$- 2 x - 14 x^{3} + 1 + 7 x^{2} \cdot 1 + x (14 x) - x^{2} (14 x)$

Step 7.5.7

Multiply $7$ by $1$ .

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + x (14 x) - x^{2} (14 x)$

Step 7.5.8

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

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 (x^{1} x) - x^{2} (14 x)$

Step 7.5.9

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

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 (x^{1} x^{1}) - x^{2} (14 x)$

Step 7.5.10

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

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{1 + 1} - x^{2} (14 x)$

Step 7.5.11

Add $1$ and $1$ .

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{2} - x^{2} (14 x)$

Step 7.5.12

Multiply $14$ by $- 1$ .

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{2} - 14 x^{2} x$

Step 7.5.13

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

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{2} - 14 (x^{1} x^{2})$

Step 7.5.14

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

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{2} - 14 x^{1 + 2}$

Step 7.5.15

Add $1$ and $2$ .

$- 2 x - 14 x^{3} + 1 + 7 x^{2} + 14 x^{2} - 14 x^{3}$

Step 7.5.16

Add $7 x^{2}$ and $14 x^{2}$ .

$- 2 x - 14 x^{3} + 1 + 21 x^{2} - 14 x^{3}$

Step 7.5.17

Subtract $14 x^{3}$ from $- 14 x^{3}$ .

$- 2 x - 28 x^{3} + 1 + 21 x^{2}$

Step 7.6

Reorder terms.

$- 28 x^{3} + 21 x^{2} - 2 x + 1$