Algebra Examples

$f (x) = \frac{1}{x - 3}$ , $g (x) = \frac{1}{x}$

Step 1

Set up the composite result function.

$f (g (x))$

Step 2

Evaluate $f (\frac{1}{x})$ by substituting in the value of $g$ into $f$ .

$f (\frac{1}{x}) = \frac{1}{(\frac{1}{x}) - 3}$

Step 3

Simplify the denominator.

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Step 3.1

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

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

Step 3.2

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

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

Step 3.3

Combine the numerators over the common denominator.

$f (\frac{1}{x}) = \frac{1}{\frac{1 - 3 x}{x}}$

Step 4

Multiply the numerator by the reciprocal of the denominator.

$f (\frac{1}{x}) = 1 (\frac{x}{1 - 3 x})$

Step 5

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

$f (\frac{1}{x}) = \frac{x}{1 - 3 x}$