Precalculus Examples

$f (x) = 6 x + 8$ , $g (x) = 3 x^{2}$

Step 1

Set up the composite result function.

$f (g (x))$

Step 2

Evaluate $f (3 x^{2})$ by substituting in the value of $g$ into $f$ .

$f (3 x^{2}) = 6 (3 x^{2}) + 8$

Step 3

Multiply $3$ by $6$ .

$f (3 x^{2}) = 18 x^{2} + 8$