Calculus Examples

$- 4 x^{\frac{5}{3}} + 3 x^{\frac{7}{3}} + 8$

Step 1

By the Sum Rule, the derivative of $- 4 x^{\frac{5}{3}} + 3 x^{\frac{7}{3}} + 8$ with respect to $x$ is $\frac{d}{d x} [- 4 x^{\frac{5}{3}}] + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$ .

$\frac{d}{d x} [- 4 x^{\frac{5}{3}}] + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2

Evaluate $\frac{d}{d x} [- 4 x^{\frac{5}{3}}]$ .

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Step 2.1

Since $- 4$ is constant with respect to $x$ , the derivative of $- 4 x^{\frac{5}{3}}$ with respect to $x$ is $- 4 \frac{d}{d x} [x^{\frac{5}{3}}]$ .

$- 4 \frac{d}{d x} [x^{\frac{5}{3}}] + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{5}{3}$ .

$- 4 (\frac{5}{3} x^{\frac{5}{3} - 1}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.3

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$- 4 (\frac{5}{3} x^{\frac{5}{3} - 1 \cdot \frac{3}{3}}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.4

Combine $- 1$ and $\frac{3}{3}$ .

$- 4 (\frac{5}{3} x^{\frac{5}{3} + \frac{- 1 \cdot 3}{3}}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.5

Combine the numerators over the common denominator.

$- 4 (\frac{5}{3} x^{\frac{5 - 1 \cdot 3}{3}}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.6

Simplify the numerator.

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Step 2.6.1

Multiply $- 1$ by $3$ .

$- 4 (\frac{5}{3} x^{\frac{5 - 3}{3}}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.6.2

Subtract $3$ from $5$ .

$- 4 (\frac{5}{3} x^{\frac{2}{3}}) + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.7

Combine $\frac{5}{3}$ and $x^{\frac{2}{3}}$ .

$- 4 \frac{5 x^{\frac{2}{3}}}{3} + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.8

Combine $- 4$ and $\frac{5 x^{\frac{2}{3}}}{3}$ .

$\frac{- 4 (5 x^{\frac{2}{3}})}{3} + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.9

Multiply $5$ by $- 4$ .

$\frac{- 20 x^{\frac{2}{3}}}{3} + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 2.10

Move the negative in front of the fraction.

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{d}{d x} [3 x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 3

Evaluate $\frac{d}{d x} [3 x^{\frac{7}{3}}]$ .

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Step 3.1

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{\frac{7}{3}}$ with respect to $x$ is $3 \frac{d}{d x} [x^{\frac{7}{3}}]$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 \frac{d}{d x} [x^{\frac{7}{3}}] + \frac{d}{d x} [8]$

Step 3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{3}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{7}{3} - 1}) + \frac{d}{d x} [8]$

Step 3.3

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{7}{3} - 1 \cdot \frac{3}{3}}) + \frac{d}{d x} [8]$

Step 3.4

Combine $- 1$ and $\frac{3}{3}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{7}{3} + \frac{- 1 \cdot 3}{3}}) + \frac{d}{d x} [8]$

Step 3.5

Combine the numerators over the common denominator.

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{7 - 1 \cdot 3}{3}}) + \frac{d}{d x} [8]$

Step 3.6

Simplify the numerator.

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Step 3.6.1

Multiply $- 1$ by $3$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{7 - 3}{3}}) + \frac{d}{d x} [8]$

Step 3.6.2

Subtract $3$ from $7$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 (\frac{7}{3} x^{\frac{4}{3}}) + \frac{d}{d x} [8]$

Step 3.7

Combine $\frac{7}{3}$ and $x^{\frac{4}{3}}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 3 \frac{7 x^{\frac{4}{3}}}{3} + \frac{d}{d x} [8]$

Step 3.8

Combine $3$ and $\frac{7 x^{\frac{4}{3}}}{3}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{3 (7 x^{\frac{4}{3}})}{3} + \frac{d}{d x} [8]$

Step 3.9

Multiply $7$ by $3$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{21 x^{\frac{4}{3}}}{3} + \frac{d}{d x} [8]$

Step 3.10

Factor $3$ out of $21 x^{\frac{4}{3}}$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{3 (7 x^{\frac{4}{3}})}{3} + \frac{d}{d x} [8]$

Step 3.11

Cancel the common factors.

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Step 3.11.1

Factor $3$ out of $3$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{3 (7 x^{\frac{4}{3}})}{3 (1)} + \frac{d}{d x} [8]$

Step 3.11.2

Cancel the common factor.

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{3 (7 x^{\frac{4}{3}})}{3 \cdot 1} + \frac{d}{d x} [8]$

Step 3.11.3

Rewrite the expression.

$- \frac{20 x^{\frac{2}{3}}}{3} + \frac{7 x^{\frac{4}{3}}}{1} + \frac{d}{d x} [8]$

Step 3.11.4

Divide $7 x^{\frac{4}{3}}$ by $1$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 7 x^{\frac{4}{3}} + \frac{d}{d x} [8]$

Step 4

Since $8$ is constant with respect to $x$ , the derivative of $8$ with respect to $x$ is $0$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 7 x^{\frac{4}{3}} + 0$

Step 5

Simplify.

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Step 5.1

Add $- \frac{20 x^{\frac{2}{3}}}{3} + 7 x^{\frac{4}{3}}$ and $0$ .

$- \frac{20 x^{\frac{2}{3}}}{3} + 7 x^{\frac{4}{3}}$

Step 5.2

Reorder terms.

$7 x^{\frac{4}{3}} - \frac{20 x^{\frac{2}{3}}}{3}$