Question

Jika f(x)=3-4x dana g(x)=2x+5, tentukan: (x)

Answer 1

(fog)(x) = f(g(x))
f(g(x)) = 3-4(2x+5)
f(g(x)) = 3-8x-20 = -8x-17
(fog)^-1 (x) = y
y = -8x-17
-8x = -17-y
x = (y+17)/8

(fog)^-1 (x) = (x+17)/8