Precalculus Examples

$f (x) = - x$ , $g (x) = 2 x - 5$ , $(g \circ f)$

Step 1

Set up the composite result function.

$g (f (x))$

Step 2

Evaluate $g (- x)$ by substituting in the value of $f$ into $g$ .

$g (- x) = 2 (- x) - 5$

Step 3

Multiply $- 1$ by $2$ .

$g (- x) = - 2 x - 5$