Question

If f(x) = 2x + 3 and g(x) = 4x – 5, what is f(x) ◦ g(x)?
Answer
a 18x + 3
b 8x – 7
c 8x – 15
d 8x + 7

Answer 1

f(x)◦ g(x) = f(g(x)) which means everywhere you see x, put the entire g(x) in it:

2(4x-5) + 3 = 8x - 10 + 3 = 8x - 7