Question

f(x) = 1-4x, (gof)(x) = 5-2x find g(x)

Answer 1

5 - 2x = (1/2)(1-4x) + 9/2

Therefore

g(x) = x/2 + 9/2

since
gof(x) = g(1-4x) = (1-4x)/2 + 9/2
= 5 - 2x