Question

F(x) =3x; g(x) = 4x^2 +1

Which expression is equal to (fog) (x)?


a 4x^2 + 3x -1
b 12x^3 + 3x
c 36^2 + 1
d 12x^2 + 3

Answer 1

D

Explanation:

(f of g)(x) means to do f(g(x)). We will substitute g(x) into f(x) and simplify.

`f(g(x))= 3(4x^2+1)=12x^2+3`