Test 8 Section 3 #15

You’re given:

Then you’re asked for the value of . In function-in-function questions like this, the thing to remember is that you plug in the argument for every appearance of *x* in a function, *including* other functions in that function. In other words, because we know that , we know that .

And of course, from the first function we’re given, we can calculate the value of :

Now plug that back into the equation for :