If the function f is defined by f (x) = 5, then 2 (f (x)) =

10

Problem: What is 2 (f (x)) if f (x) = 5?

Step-by-step explanation:

If f (x) = 5, then 2 (f (x)) = 2 (5) by substitution.

So 2 (f (x)) = 10 since 2 (5) = 10.

The answer is 10.

Maybe the following looks a little better for understanding:

2 (f (x))

2 (5)

10