Question

If f(x) = 2x + 1, and
g(x) = x - 3, then
g(f(x)) = 2x + ?

Answer 1

Below in bold.

Explanation:

To get g(f(x)) we replace the x in g(x) by f(x) and simplify:

g(f(x)) = (2x + 1) - 3

= 2x - 2.