diketahui fog x kuadrat-5, g (x)= x+3, maka f (x) x+2

(fog)(x) =x^2 - 5
f(g(x))=x^2-5
f(x+3) =x^2 -5
misal x + 3 =a maka x = (a-3)
f(a) = (a-3)^2 -5
f(x+2)= (x+2-3)^2 -5
f(x+2) =x^2 -2x-4