Calculus Examples

$f (x) = 5 x {(2 x^{3} - 7)}^{\frac{1}{2}}$

Step 1

Since $5$ is constant with respect to $x$ , the derivative of $5 x {(2 x^{3} - 7)}^{\frac{1}{2}}$ with respect to $x$ is $5 \frac{d}{d x} [x {(2 x^{3} - 7)}^{\frac{1}{2}}]$ .

$5 \frac{d}{d x} [x {(2 x^{3} - 7)}^{\frac{1}{2}}]$

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 $g (x) = {(2 x^{3} - 7)}^{\frac{1}{2}}$ .

$5 (x \frac{d}{d x} [{(2 x^{3} - 7)}^{\frac{1}{2}}] + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = 2 x^{3} - 7$ .

Tap for more steps...

Step 3.1

To apply the Chain Rule, set $u$ as $2 x^{3} - 7$ .

$5 (x (\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3.2

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

$5 (x (\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3.3

Replace all occurrences of $u$ with $2 x^{3} - 7$ .

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{1}{2} - 1} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 5

Combine $- 1$ and $\frac{2}{2}$ .

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 6

Combine the numerators over the common denominator.

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 7

Simplify the numerator.

Tap for more steps...

Step 7.1

Multiply $- 1$ by $2$ .

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{1 - 2}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 7.2

Subtract $2$ from $1$ .

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{\frac{- 1}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8

Combine fractions.

Tap for more steps...

Step 8.1

Move the negative in front of the fraction.

$5 (x (\frac{1}{2} {(2 x^{3} - 7)}^{- \frac{1}{2}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.2

Combine $\frac{1}{2}$ and ${(2 x^{3} - 7)}^{- \frac{1}{2}}$ .

$5 (x (\frac{{(2 x^{3} - 7)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.3

Move ${(2 x^{3} - 7)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$5 (x (\frac{1}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} \frac{d}{d x} [2 x^{3} - 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.4

Combine $\frac{1}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}}$ and $x$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} \frac{d}{d x} [2 x^{3} - 7] + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 9

By the Sum Rule, the derivative of $2 x^{3} - 7$ with respect to $x$ is $\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [- 7]$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [- 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 10

Since $2$ is constant with respect to $x$ , the derivative of $2 x^{3}$ with respect to $x$ is $2 \frac{d}{d x} [x^{3}]$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (2 \frac{d}{d x} [x^{3}] + \frac{d}{d x} [- 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 11

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (2 (3 x^{2}) + \frac{d}{d x} [- 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 12

Multiply $3$ by $2$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (6 x^{2} + \frac{d}{d x} [- 7]) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 13

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7$ with respect to $x$ is $0$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (6 x^{2} + 0) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 14

Combine fractions.

Tap for more steps...

Step 14.1

Add $6 x^{2}$ and $0$ .

$5 (\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} (6 x^{2}) + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 14.2

Combine $6$ and $\frac{x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}}$ .

$5 (\frac{6 x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} x^{2} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 14.3

Combine $\frac{6 x}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}}$ and $x^{2}$ .

$5 (\frac{6 x \cdot x^{2}}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 15

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

Tap for more steps...

Step 15.1

Move $x^{2}$ .

$5 (\frac{6 (x^{2} x)}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 15.2

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

Tap for more steps...

Step 15.2.1

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

$5 (\frac{6 (x^{2} x^{1})}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 15.2.2

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

$5 (\frac{6 x^{2 + 1}}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 15.3

Add $2$ and $1$ .

$5 (\frac{6 x^{3}}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 16

Factor $2$ out of $6 x^{3}$ .

$5 (\frac{2 (3 x^{3})}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 17

Cancel the common factors.

Tap for more steps...

Step 17.1

Factor $2$ out of $2 {(2 x^{3} - 7)}^{\frac{1}{2}}$ .

$5 (\frac{2 (3 x^{3})}{2 ({(2 x^{3} - 7)}^{\frac{1}{2}})} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 17.2

Cancel the common factor.

$5 (\frac{2 (3 x^{3})}{2 {(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 17.3

Rewrite the expression.

$5 (\frac{3 x^{3}}{{(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 18

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

$5 (\frac{3 x^{3}}{{(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}} \cdot 1)$

Step 19

Multiply ${(2 x^{3} - 7)}^{\frac{1}{2}}$ by $1$ .

$5 (\frac{3 x^{3}}{{(2 x^{3} - 7)}^{\frac{1}{2}}} + {(2 x^{3} - 7)}^{\frac{1}{2}})$

Step 20

To write ${(2 x^{3} - 7)}^{\frac{1}{2}}$ as a fraction with a common denominator, multiply by $\frac{{(2 x^{3} - 7)}^{\frac{1}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$ .

$5 (\frac{3 x^{3}}{{(2 x^{3} - 7)}^{\frac{1}{2}}} + \frac{{(2 x^{3} - 7)}^{\frac{1}{2}} {(2 x^{3} - 7)}^{\frac{1}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}})$

Step 21

Combine the numerators over the common denominator.

$5 \frac{3 x^{3} + {(2 x^{3} - 7)}^{\frac{1}{2}} {(2 x^{3} - 7)}^{\frac{1}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 22

Multiply ${(2 x^{3} - 7)}^{\frac{1}{2}}$ by ${(2 x^{3} - 7)}^{\frac{1}{2}}$ by adding the exponents.

Tap for more steps...

Step 22.1

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

$5 \frac{3 x^{3} + {(2 x^{3} - 7)}^{\frac{1}{2} + \frac{1}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 22.2

Combine the numerators over the common denominator.

$5 \frac{3 x^{3} + {(2 x^{3} - 7)}^{\frac{1 + 1}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 22.3

Add $1$ and $1$ .

$5 \frac{3 x^{3} + {(2 x^{3} - 7)}^{\frac{2}{2}}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 22.4

Divide $2$ by $2$ .

$5 \frac{3 x^{3} + {(2 x^{3} - 7)}^{1}}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 23

Simplify ${(2 x^{3} - 7)}^{1}$ .

$5 \frac{3 x^{3} + 2 x^{3} - 7}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 24

Add $3 x^{3}$ and $2 x^{3}$ .

$5 \frac{5 x^{3} - 7}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$

Step 25

Combine $5$ and $\frac{5 x^{3} - 7}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$ .

$\frac{5 (5 x^{3} - 7)}{{(2 x^{3} - 7)}^{\frac{1}{2}}}$