Calculus Examples

$\frac{\frac{1}{3 + x} - \frac{1}{3}}{x}$

Step 1

Simplify the numerator.

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Step 1.1

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

$\frac{\frac{1}{3 + x} \cdot \frac{3}{3} - \frac{1}{3}}{x}$

Step 1.2

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

$\frac{\frac{1}{3 + x} \cdot \frac{3}{3} - \frac{1}{3} \cdot \frac{3 + x}{3 + x}}{x}$

Step 1.3

Write each expression with a common denominator of $(3 + x) \cdot 3$ , by multiplying each by an appropriate factor of $1$ .

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Step 1.3.1

Multiply $\frac{1}{3 + x}$ by $\frac{3}{3}$ .

$\frac{\frac{3}{(3 + x) \cdot 3} - \frac{1}{3} \cdot \frac{3 + x}{3 + x}}{x}$

Step 1.3.2

Multiply $\frac{1}{3}$ by $\frac{3 + x}{3 + x}$ .

$\frac{\frac{3}{(3 + x) \cdot 3} - \frac{3 + x}{3 (3 + x)}}{x}$

Step 1.3.3

Reorder the factors of $(3 + x) \cdot 3$ .

$\frac{\frac{3}{3 (3 + x)} - \frac{3 + x}{3 (3 + x)}}{x}$

Step 1.4

Combine the numerators over the common denominator.

$\frac{\frac{3 - (3 + x)}{3 (3 + x)}}{x}$

Step 1.5

Rewrite $\frac{3 - (3 + x)}{3 (3 + x)}$ in a factored form.

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Step 1.5.1

Apply the distributive property.

$\frac{\frac{3 - 1 \cdot 3 - x}{3 (3 + x)}}{x}$

Step 1.5.2

Multiply $- 1$ by $3$ .

$\frac{\frac{3 - 3 - x}{3 (3 + x)}}{x}$

Step 1.5.3

Subtract $3$ from $3$ .

$\frac{\frac{0 - x}{3 (3 + x)}}{x}$

Step 1.5.4

Subtract $x$ from $0$ .

$\frac{\frac{- x}{3 (3 + x)}}{x}$

Step 1.6

Move the negative in front of the fraction.

$\frac{- \frac{x}{3 (3 + x)}}{x}$

Step 2

Multiply the numerator by the reciprocal of the denominator.

$- \frac{x}{3 (3 + x)} \cdot \frac{1}{x}$

Step 3

Cancel the common factor of $x$ .

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Step 3.1

Move the leading negative in $- \frac{x}{3 (3 + x)}$ into the numerator.

$\frac{- x}{3 (3 + x)} \cdot \frac{1}{x}$

Step 3.2

Factor $x$ out of $- x$ .

$\frac{x \cdot - 1}{3 (3 + x)} \cdot \frac{1}{x}$

Step 3.3

Cancel the common factor.

$\frac{x \cdot - 1}{3 (3 + x)} \cdot \frac{1}{x}$

Step 3.4

Rewrite the expression.

$\frac{- 1}{3 (3 + x)}$

Step 4

Move the negative in front of the fraction.

$- \frac{1}{3 (3 + x)}$