Here's f(x) again, in case you forgot:

Remember the blob game:

So, for  f(g(x))... our blob is g(x)...

There's more to the problem and we aren't finished, but I'm going to linger here for a bit because I know that this can get confusing if you jump in too quickly.

Let's look at another one...

Given

Here's  f(blob):

Here's  f(g(x)):

One more:

Given

These ( ) will be REALLY important!