I need help finding the composition of these functions and solving the equation

Question

Find (f ∘ g)(x + 5). (Simplify your answer.)

f(x) = 2x

g(x) = x − 9

(f ∘ g)(x + 5)=

Answer 1

Here are two slightly different approaches, both yielding the same answer:

1) Find and equation for f_°g(x) first, as follows: f_°g(x) = 2(x - 9) = 2x - 18

Now find f_°g(x + 5): f_°g(x + 5) = 2(x + 5) - 18 = 2x - 8

2) Find g(x+5) first, as follows: g(x+5) = x + 5 - 9 = x - 4

Now find f_°g(x+5): f_°g(x+5) = 2(x - 4) = 2x - 8