Question

In the function f(x) = 2x + 12, what is the output when the input is 15?

Answer 1

42

Explanation:

f(x) is the output

Substitute x = 15 into f(x)

f(15) = 2(15) + 12 = 30 + 12 = 42 ← output when input is 15

Answer 2

Put x=15,

f(15) = 2.15+12 = 42