# SOLUTION: Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1...

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 Question 622980: Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1...Answer by nerdybill(6948)   (Show Source): You can put this solution on YOUR website!Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1 . (g • f)(x) = (3x-4)(3x+1) FOIL the right side: (g • f)(x) = 9x^2+3x-12x-4 (g • f)(x) = 9x^2-9x-4 . finally: (g • f)(7) = 9(7)^2-9(7)-4 (g • f)(7) = 9(49)-63-4 (g • f)(7) = 441-63-4 (g • f)(7) = 378-4 (g • f)(7) = 374