SOLUTION: Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x).

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Question 60437: Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x).
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=5x+7 and g(x)=x^2+7
(g f)(x)=(5x+7)^2+7 [Dumb f into g and solve]
(g of f) (x)=(5x+7)(5x+7)+7
=25x^2+70x+49+7
=25x^2+70x+56