The graph shows the function f (x) = 3^x

What is the value of x when f (x) = 9?

A:3

B:1

C:0

D:2

The answer is D.

You have to make the whole numbers equal to then solve for the exponents:

F (x) means y, therefore, y is 9.

9 = 3^x.

3^2 is the same as 9.

Then, 3^2 = 3^x.

Then solve for the exponents,

2 = x

Therefore your answer is 2.