saya minta tolong cara no 10&11 bagi yg tau caranya tolong di bantu ya

11 B
maaf kalau salah

Bab Fungsi

10. (f o g)(x) = f(g(x))
4 - 2x = f(x + 6)

Misalkan
x + 6 = a
Maka
x = a - 6

f(a) = 4 - 2(a - 6)
f(a) = 4 - 2a + 12
f(x) = 16 - 2x [A]

11. f(x) = 2x - 6
y = 2x - 6
y + 6 = 2x
x = (y + 6)/2
x = 1/2 y + 3
f^-1(x) = 1/2 x + 3 [B]