Jika f (x) = x-2 dan g (x) =x kuadrat -2x-3 ,tentukan a.rumus fungsi (gof) (x) dan b. (fog) (2)

gof (x) = (x-2)^2 - 2 (x-2) -3 = x^2-4x+4 -2x+4 -3 = x^2-6x+5
fog (x) = x^2-2x-3-2 = x^2-2x-5
fog (2) = 2^2 - 2.2 - 5 = 4-4-5 = -5