Answer:
B
Step-by-step explanation:
You are making composite functions, since all the answers provided dont fit, I only suggest to clearify that the lone term in the B option, is actually 45x and not 45.
If this is the case, composite functions means that you eval the expresion g(x) in every x variable found in f(x).
Using this, it gives you that f(g(x))= [tex]-40x^{2} +25x+45[/tex]
