tolong dong ya kk pake cara

12.
f(x) = 2x - 6 dan g(x) = 2x^2 - 8x + 8
maka,
(g o f)(x) = g(f(x)) = 2(2x-6)^2 - 8(2x-6) + 8
(g o f)(x) = 2(4x^2 - 24x + 36) - 16x + 48 +8
(g o f)(x) = 8x^2 - 48x + 72 - 16x +56
(g o f)(x) = 8x^2 - 64x + 128

13.
f(x) = x^2 - 9 dan g(x) = x + 2
maka,
(f o g)(x) = f(g(x)) = (x + 2)^2 - 9
(f o g)(x) = x^2 + 4x + 4 - 9
(f o g)(x) = x^2 + 4x - 5
(f o g)(2) = 2^2 + 4(2) - 5
(f o g)(2) = 4 + 8 - 5 = 7 (D)

 Koreksi jika salah

(x+2)² -9 = x²+4x+4-9
=x²+4x-5
2²+4.2-5 =7
Nomer 13