Calculus Examples

$f (x) = \frac{{(2 x - 5)}^{7}}{2 x}$

Step 1

Since $\frac{1}{2}$ is constant with respect to $x$ , the derivative of $\frac{{(2 x - 5)}^{7}}{2 x}$ with respect to $x$ is $\frac{1}{2} \frac{d}{d x} [\frac{{(2 x - 5)}^{7}}{x}]$ .

$\frac{1}{2} \frac{d}{d x} [\frac{{(2 x - 5)}^{7}}{x}]$

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 $f (x) = {(2 x - 5)}^{7}$ and $g (x) = x$ .

$\frac{1}{2} \cdot \frac{x \frac{d}{d x} [{(2 x - 5)}^{7}] - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

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 $g (x) = 2 x - 5$ .

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Step 3.1

To apply the Chain Rule, set $u$ as $2 x - 5$ .

$\frac{1}{2} \cdot \frac{x (\frac{d}{d u} [u^{7}] \frac{d}{d x} [2 x - 5]) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 3.2

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

$\frac{1}{2} \cdot \frac{x (7 u^{6} \frac{d}{d x} [2 x - 5]) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 3.3

Replace all occurrences of $u$ with $2 x - 5$ .

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} \frac{d}{d x} [2 x - 5]) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4

Differentiate.

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Step 4.1

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

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} (\frac{d}{d x} [2 x] + \frac{d}{d x} [- 5])) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.2

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

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} (2 \frac{d}{d x} [x] + \frac{d}{d x} [- 5])) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.3

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

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} (2 \cdot 1 + \frac{d}{d x} [- 5])) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.4

Multiply $2$ by $1$ .

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} (2 + \frac{d}{d x} [- 5])) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.5

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5$ with respect to $x$ is $0$ .

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} (2 + 0)) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.6

Simplify the expression.

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Step 4.6.1

Add $2$ and $0$ .

$\frac{1}{2} \cdot \frac{x (7 {(2 x - 5)}^{6} \cdot 2) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.6.2

Multiply $2$ by $7$ .

$\frac{1}{2} \cdot \frac{x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7} \frac{d}{d x} [x]}{x^{2}}$

Step 4.7

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

$\frac{1}{2} \cdot \frac{x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7} \cdot 1}{x^{2}}$

Step 4.8

Combine fractions.

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Step 4.8.1

Multiply $- 1$ by $1$ .

$\frac{1}{2} \cdot \frac{x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7}}{x^{2}}$

Step 4.8.2

Multiply $\frac{1}{2}$ by $\frac{x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7}}{x^{2}}$ .

$\frac{x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7}}{2 x^{2}}$

Step 5

Simplify the numerator.

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Step 5.1

Factor ${(2 x - 5)}^{6}$ out of $x (14 {(2 x - 5)}^{6}) - {(2 x - 5)}^{7}$ .

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Step 5.1.1

Factor ${(2 x - 5)}^{6}$ out of $x (14 {(2 x - 5)}^{6})$ .

$\frac{{(2 x - 5)}^{6} (x \cdot (14)) - {(2 x - 5)}^{7}}{2 x^{2}}$

Step 5.1.2

Factor ${(2 x - 5)}^{6}$ out of $- {(2 x - 5)}^{7}$ .

$\frac{{(2 x - 5)}^{6} (x \cdot (14)) + {(2 x - 5)}^{6} (- (2 x - 5))}{2 x^{2}}$

Step 5.1.3

Factor ${(2 x - 5)}^{6}$ out of ${(2 x - 5)}^{6} (x \cdot (14)) + {(2 x - 5)}^{6} (- (2 x - 5))$ .

$\frac{{(2 x - 5)}^{6} (x \cdot (14) - (2 x - 5))}{2 x^{2}}$

Step 5.2

Move $14$ to the left of $x$ .

$\frac{{(2 x - 5)}^{6} (14 x - (2 x - 5))}{2 x^{2}}$

Step 5.3

Apply the distributive property.

$\frac{{(2 x - 5)}^{6} (14 x - (2 x) - - 5)}{2 x^{2}}$

Step 5.4

Multiply $2$ by $- 1$ .

$\frac{{(2 x - 5)}^{6} (14 x - 2 x - - 5)}{2 x^{2}}$

Step 5.5

Multiply $- 1$ by $- 5$ .

$\frac{{(2 x - 5)}^{6} (14 x - 2 x + 5)}{2 x^{2}}$

Step 5.6

Subtract $2 x$ from $14 x$ .

$\frac{{(2 x - 5)}^{6} (12 x + 5)}{2 x^{2}}$