Evaluating composite functions

So if we have f (x) and g (X) to find f (g (x)) or fog (x) we replace all the x's in f (xl with g (xl

so here is an example.

let f (x) = x+2 and g (x) = 2x ro find f (g (x)) replace the x in f (x) with g (x) so f (g (x)) = (2x) + 2