Question

F(x) = 8x + 6,

Find fg.
g(x) = 6x +3

A) 48x2+39x + 18
B) 48x2 + 60x + 18
C) 14x2 + 60x +9
D) 48x2 + 18

Answer 1

Answer: B) 48x2 + 60x + 18

Explanation:

Multiply the two functions:

(8x + 6)*(6x + 3) =

8x*6x + 8x*3 + 6*6x + 6*3 =

48x2 + 24x + 36x + 18 =

48x2 + 60x + 18