Question

What is x if f(x) is 64 in the function below? f(x) = 4x

Answer 1

x = 16

Explanation:

f(x) = 64

f(x) = 4x

So, 4x = 64

4x = 64

Divide each side

4x = 64

---- ----

4 4

4x/4 = x

64/4 = 16

x = 16