Question

Find (g ○ f )(x ) where `f(x)=x2+8,g(x)=5x-2.

Answer 1

(g ○ f)(x) = 5x² + 38

Explanation:

to find (g ○ f)(x) substitute x = f(x) into g(x) , that is

g(f(x)

= g(x² + 8)

= 5(x² + 8) - 2

= 5x² + 40 - 2

= 5x² + 38