Question

F(x)=-5x

G(x)=8x^2-5x-9
Find (f•g)(x)
A.-40x^4+25x^3+45x^2
B.-40x^3-5x-9
C.-40x^2+25x+45x
D.-40x^3+25^2+45x

Answer 1

D

Explanation:

(f×g)(x)=-5x(8x^2-5x-9)=-5x(8x^2)-5x(-5x)-5x (-9)=-40x^3+25x^2+45x