Finite Math Examples

$f (x) = \frac{2}{1 - 5 x}$ , $h (x) = \frac{1}{x}$

Step 1

Set up the composite result function.

$f (h (x))$

Step 2

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

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

Step 3

Simplify the denominator.

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Step 3.1

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

$f (\frac{1}{x}) = \frac{2}{1 + \frac{- 5}{x}}$

Step 3.2

Move the negative in front of the fraction.

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

Step 3.3

Write $1$ as a fraction with a common denominator.

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

Step 3.4

Combine the numerators over the common denominator.

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

Step 4

Multiply the numerator by the reciprocal of the denominator.

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

Step 5

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

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