Tolong nomor 9 dan 16 beserta caranya

9) h(x) = x - 4 => h(3) = 3 - 4 = -1
g(x) = x + 6 => g(-1) = -1 + 6 = 5
f(x) = 5 - 2x => f(5) = 5 - 2(5) = -5
Definisi invers : f(x) = y => f^-1(y) = x

(f o g o h)^-1(x) = 3 => (f o g o h)(3) = x
=> x = (f o g)(h(3)) = (f o g)(-1) = f(g(-1)) = f(5) = -5

16) f(x) = x - 2
f(2x) + 2f(x)
= (2x) - 2 + 2(x - 2)
= 2x - 2 + 2x - 4
= 4x - 6