Diketahui fungsi f(x) =x+3 dan g(x) =x2+8x+15,tentukanlah: A.(fog)(x) B. (gof) (x)

Bab Fungsi

a. (f o g)(x)
= f(g(x))
= f(x^2 + 8x + 15)
= (x^2 + 8x + 15) + 3
= x^2 + 8x + 18

b. (g o f)(x)
= g(f(x))
= g(x + 3)
= (x + 3)^2 + 8(x + 3) + 15
= (x^2 + 6x + 9) + 8x + 24 + 15
= x^2 + 14x + 48