Question

Assume f(x) = -2x + 8 and g(x) = 5x. What is the value of (f o g)(3)?

A. 3x + 8
B. -22
C. 29
D. 17

is it B?

Answer 1

(f o g)(3)
means "f of g of 3"
which is the same as
f(g(3))
plug 3 into g, and then plug that into f.

g(3) = 5*3 = 15
f(g(3)) = f(15) = -2(15)+8 = -30+8 = -22
So, yes. Good work =)