Question

Tried working this one but to no avail. Could someone point me in the right direction?
Let g(x) = x+1 and
(f of g)(x) = x^2+2x+1.
Then
f(x) = ,
and
(g of f) (x) =

Answer 1

I've tried diving (f of g)(x) by g(x), which will get me x+1, but that answer isn't being accepted as correct. Completely stumped.

Answer 2

dividing*