Minta tolong cara nomer 2,3 dan 4 buat pr makasi

f + g = 5x^3 + 2x -6 dan g = 4x^2 -5x
f + (4x^2 -5x) = 5x^3 + 2x - 6
f = (5x^3 + 2x -6)-(4x^2-5x)
f (x) = 5x^3 -4x^2 +7x -6
3) f (x) = x^2 + 5x + 1 dan g (x) = x - 1
f (x) x g (x) = (x^2 +5x +1)(x -1)
= 5x^3 -x^2 +5x^2 -5x + x -1
= 5x^3 +4x^2-4x -1
4) f (x) = x + 2 dan g(x) = x^2 -2
gof(x) = g { f(x) }
= g (x +2)
= (x+2)^2 -2
= x^2 + 4x +4 -2
= x^2 +4x +2