Hello there! We are given the following equation and want to solve for f(f(x))

f(f(x)) will be replacing the "x" in f(x) with the entire equation of f(x), it sounds a bit complicated, but this is what it will look like:

Using FOIL or the formula for squaring a binomial gives us:

Open parenthesis and simplify

This should be your answer. Let me know if you need any clarifications, thanks!
~ Padoru