Question

If f(x) = 8 – 10x and g(x) = 5x + 4, what is the value of (fg)(–2)?

–196
–168
22
78

Answer 1

-168

Explanation:

because f(x) = 8 - 10xg(x) = 5x + 4

(fg)(x) = (8 - 10x)(5x + 4)(fg)(x) = 40x + 32 - 50x^2 - 40x(fg)(x) = 32 - 50x^2

(fg)(-2) = 32 - 50(-2)^2(fg)(-2) = 32 - 200(fg)(-2) = -168