Calculus Examples

$- 6 x {(2 x^{7} - 1)}^{7}$

Step 1

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x {(2 x^{7} - 1)}^{7}$ with respect to $x$ is $- 6 \frac{d}{d x} [x {(2 x^{7} - 1)}^{7}]$ .

$- 6 \frac{d}{d x} [x {(2 x^{7} - 1)}^{7}]$

Step 2

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 $f (x) = x$ and $g (x) = {(2 x^{7} - 1)}^{7}$ .

$- 6 (x \frac{d}{d x} [{(2 x^{7} - 1)}^{7}] + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 3

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

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Step 3.1

To apply the Chain Rule, set $u$ as $2 x^{7} - 1$ .

$- 6 (x (\frac{d}{d u} [u^{7}] \frac{d}{d x} [2 x^{7} - 1]) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 3.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = 7$ .

$- 6 (x (7 u^{6} \frac{d}{d x} [2 x^{7} - 1]) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 3.3

Replace all occurrences of $u$ with $2 x^{7} - 1$ .

$- 6 (x (7 {(2 x^{7} - 1)}^{6} \frac{d}{d x} [2 x^{7} - 1]) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4

Differentiate.

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Step 4.1

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

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (\frac{d}{d x} [2 x^{7}] + \frac{d}{d x} [- 1])) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.2

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

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (2 \frac{d}{d x} [x^{7}] + \frac{d}{d x} [- 1])) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 7$ .

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (2 (7 x^{6}) + \frac{d}{d x} [- 1])) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.4

Multiply $7$ by $2$ .

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (14 x^{6} + \frac{d}{d x} [- 1])) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.5

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

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (14 x^{6} + 0)) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.6

Simplify the expression.

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Step 4.6.1

Add $14 x^{6}$ and $0$ .

$- 6 (x (7 {(2 x^{7} - 1)}^{6} (14 x^{6})) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 4.6.2

Multiply $14$ by $7$ .

$- 6 (x (98 {(2 x^{7} - 1)}^{6} x^{6}) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 5

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

$- 6 (x^{6} x^{1} (98 {(2 x^{7} - 1)}^{6}) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 6

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

$- 6 (x^{6 + 1} (98 {(2 x^{7} - 1)}^{6}) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 7

Add $6$ and $1$ .

$- 6 (x^{7} (98 {(2 x^{7} - 1)}^{6}) + {(2 x^{7} - 1)}^{7} \frac{d}{d x} [x])$

Step 8

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

$- 6 (x^{7} (98 {(2 x^{7} - 1)}^{6}) + {(2 x^{7} - 1)}^{7} \cdot 1)$

Step 9

Multiply ${(2 x^{7} - 1)}^{7}$ by $1$ .

$- 6 (x^{7} (98 {(2 x^{7} - 1)}^{6}) + {(2 x^{7} - 1)}^{7})$

Step 10

Simplify.

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Step 10.1

Apply the distributive property.

$- 6 (x^{7} (98 {(2 x^{7} - 1)}^{6})) - 6 {(2 x^{7} - 1)}^{7}$

Step 10.2

Multiply $98$ by $- 6$ .

$- 588 (x^{7} ({(2 x^{7} - 1)}^{6})) - 6 {(2 x^{7} - 1)}^{7}$

Step 10.3

Factor $6 {(2 x^{7} - 1)}^{6}$ out of $- 588 x^{7} {(2 x^{7} - 1)}^{6} - 6 {(2 x^{7} - 1)}^{7}$ .

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Step 10.3.1

Factor $6 {(2 x^{7} - 1)}^{6}$ out of $- 588 x^{7} {(2 x^{7} - 1)}^{6}$ .

$6 {(2 x^{7} - 1)}^{6} (- 98 x^{7}) - 6 {(2 x^{7} - 1)}^{7}$

Step 10.3.2

Factor $6 {(2 x^{7} - 1)}^{6}$ out of $- 6 {(2 x^{7} - 1)}^{7}$ .

$6 {(2 x^{7} - 1)}^{6} (- 98 x^{7}) + 6 {(2 x^{7} - 1)}^{6} (- (2 x^{7} - 1))$

Step 10.3.3

Factor $6 {(2 x^{7} - 1)}^{6}$ out of $6 {(2 x^{7} - 1)}^{6} (- 98 x^{7}) + 6 {(2 x^{7} - 1)}^{6} (- (2 x^{7} - 1))$ .

$6 {(2 x^{7} - 1)}^{6} (- 98 x^{7} - (2 x^{7} - 1))$