Question

If given f(x) = –4x – 2 and g(x) = 2x, what is (f · g)(x)?

A.
(f · g)(x) = –6x – 4
B.
(f · g)(x) = –8x2 – 4x
C.
(f · g)(x) = –6x – 2
D.
(f · g)(x) = –16x2 – 4x

Answer 1

Explanation:

Given

f(x) = - 4x - 2

g(x) = 2x

(f • g) (x) = ?

We know

f(g(x)) = f ( 2x )

= - 4 ( 2x ) - 2

= - 8x - 2