tentukan rumus fungsi f(x) dan nilai f(2) jika diketahui: a. g(x) =x+2 dan (gof) (x) =x kuadrat-6x+9 b. g(x) =x+5 dan (gof) (x) =(x-1)^2

a) (gof)(x) = x²-6x+9
g(f(x)) = x²-6x+9
f(x) + 2 = x²-6x+9
f(x) = x²-6x+7

f(2) = 4-12+7= -1

b) (gof)(x) = (x-1)²
g(f(x)) = (x-1)(x-1)
g(f(x)) = x²-2x+1
f(x)+5 = x²-2x+1
f(x) = x²-2x-4

f(2) = 4-4-4 = -4