Question 284624
f(g(x)) means to plug to the value of g(x) for x in the function f(x).

What is g(x)? g(x) = x - 4, right?

What is f(x)?  f(x) = 2^2 - x, right?

Then f(x - 4) = 2^2 - (x - 4) = f(g(x)).

f(x - 4) = 4 - x + 4

f(x - 4) = -x + 8

This means that f(g(x)) = -x + 8

Got it?

Here is one for you:

Find f(g(x)) using the same value for f(x) when g(x) = apple.

How do you think we do this one?