Diketahui f (x)= x + 3 dan g (x)=x². Hitunglah (f + g)(a) dan (g ° f) (−2)

f(x) = x + 3
g(x) = x²

•
(f + g)(a)
= f(a) + g(a)
= a + 3 + a²
= a² + a + 3 ✔

••
g(f(-2))
= g(-2 + 3)
= g(1)
= 1²
= 1 ✔