Question

What is f(3) if f(x) = 2x + 1?

Answer 1

f(3) = 7

Explanation:

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

f(3) = 2(3) + 1 = 6 + 1 = 7

Answer 2

Plug in 3 for x
f(3) = 2(3) + 1
f(3) = 6 + 1
Solution is 7