Jika f(x) = 2x + 4 , (g o f)(x) = 4x² + 12x + 6 . Maka g(x) adalah.........

jawab

f(x)= 2 x+ 4
gof(x)=  4x^2 + 12x + 6
g { f(x)} = 4x^2 + 12x + 6
g (2x + 4) = 4x^2 + 12x + 6
g(2x + 4) = (2x +4)^2  - 2(2x  + 4) - 2
g(x) = x^ 2 - 2x  - 2