Question

What is the value of f(x) = 20 (2x) when x = 3

Answer 1

Replace x with 3:

f(3) = 20(2 • 3)
f(3) = 20(6)
f(3) = 120

Now solve for f:

3f/3 = 120/3
f = 40

Now check:

40(3) = 120
120 = 120