Question

F(x) = 2x and g(x) = x + 1, find f(3) and find gf(3)

Answer 1

6 and 7

Explanation:

To evaluate f(3), substitute x = 3 into f(x) , that is

f(3) = 2(3) = 6

To evaluate g(f(3)), substitute f(3) = 6 into g(x)

g(6) = 6 + 1 = 7