jika diketahui f(x) =x-2 dan (gof(x))=x^2+5x+4. tentukan g(x).....

jawab

f(x)  = x -2
gof(x) = x^2  + 5x  +4
g(x-2) = x^2+ 5x + 4

g(x)= (x +2)^2 + 5(x +2) + 4
g(x)= x^2 + 4x + 4 + 5x +10 + 4
g(x)= x^2 + 9x + 18