Calculus Examples

$y = 5 x^{2} - 5 \sqrt{x} - \frac{3}{x}$

Step 1

By the Sum Rule, the derivative of $5 x^{2} - 5 \sqrt{x} - \frac{3}{x}$ with respect to $x$ is $\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [- 5 \sqrt{x}] + \frac{d}{d x} [- \frac{3}{x}]$ .

$\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [- 5 \sqrt{x}] + \frac{d}{d x} [- \frac{3}{x}]$

Step 2

Evaluate $\frac{d}{d x} [5 x^{2}]$ .

Tap for more steps...

Step 2.1

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

$5 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 5 \sqrt{x}] + \frac{d}{d x} [- \frac{3}{x}]$

Step 2.2

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

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

Step 2.3

Multiply $2$ by $5$ .

$10 x + \frac{d}{d x} [- 5 \sqrt{x}] + \frac{d}{d x} [- \frac{3}{x}]$

Step 3

Evaluate $\frac{d}{d x} [- 5 \sqrt{x}]$ .

Tap for more steps...

Step 3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x}$ as $x^{\frac{1}{2}}$ .

$10 x + \frac{d}{d x} [- 5 x^{\frac{1}{2}}] + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.2

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

$10 x - 5 \frac{d}{d x} [x^{\frac{1}{2}}] + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.3

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

$10 x - 5 (\frac{1}{2} x^{\frac{1}{2} - 1}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.4

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

$10 x - 5 (\frac{1}{2} x^{\frac{1}{2} - 1 \cdot \frac{2}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.5

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

$10 x - 5 (\frac{1}{2} x^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.6

Combine the numerators over the common denominator.

$10 x - 5 (\frac{1}{2} x^{\frac{1 - 1 \cdot 2}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.7

Simplify the numerator.

Tap for more steps...

Step 3.7.1

Multiply $- 1$ by $2$ .

$10 x - 5 (\frac{1}{2} x^{\frac{1 - 2}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.7.2

Subtract $2$ from $1$ .

$10 x - 5 (\frac{1}{2} x^{\frac{- 1}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.8

Move the negative in front of the fraction.

$10 x - 5 (\frac{1}{2} x^{- \frac{1}{2}}) + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.9

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

$10 x - 5 \frac{x^{- \frac{1}{2}}}{2} + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.10

Combine $- 5$ and $\frac{x^{- \frac{1}{2}}}{2}$ .

$10 x + \frac{- 5 x^{- \frac{1}{2}}}{2} + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.11

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

$10 x + \frac{- 5}{2 x^{\frac{1}{2}}} + \frac{d}{d x} [- \frac{3}{x}]$

Step 3.12

Move the negative in front of the fraction.

$10 x - \frac{5}{2 x^{\frac{1}{2}}} + \frac{d}{d x} [- \frac{3}{x}]$

Step 4

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

Tap for more steps...

Step 4.1

Since $- 3$ is constant with respect to $x$ , the derivative of $- \frac{3}{x}$ with respect to $x$ is $- 3 \frac{d}{d x} [\frac{1}{x}]$ .

$10 x - \frac{5}{2 x^{\frac{1}{2}}} - 3 \frac{d}{d x} [\frac{1}{x}]$

Step 4.2

Rewrite $\frac{1}{x}$ as $x^{- 1}$ .

$10 x - \frac{5}{2 x^{\frac{1}{2}}} - 3 \frac{d}{d x} [x^{- 1}]$

Step 4.3

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

$10 x - \frac{5}{2 x^{\frac{1}{2}}} - 3 (- x^{- 2})$

Step 4.4

Multiply $- 1$ by $- 3$ .

$10 x - \frac{5}{2 x^{\frac{1}{2}}} + 3 x^{- 2}$

Step 5

Simplify.

Tap for more steps...

Step 5.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$10 x - \frac{5}{2 x^{\frac{1}{2}}} + 3 \frac{1}{x^{2}}$

Step 5.2

Combine $3$ and $\frac{1}{x^{2}}$ .

$10 x - \frac{5}{2 x^{\frac{1}{2}}} + \frac{3}{x^{2}}$

Step 5.3

Reorder terms.

$10 x + \frac{3}{x^{2}} - \frac{5}{2 x^{\frac{1}{2}}}$