tolong jawabkan dengan caranya trimakasih:)

f(x) = 4x
f(g(x)) = 4. g(x)
-x/2 + 1 = 4 g(x)
-x + 2 = 8 g(x)
g(x) = (-x + 2) / 8
g(x) = -x/8 + 1/4

f(x) = 4x
f(g(x)) = -x/2 + 1
4 g(x) = -1/2 x + 2/2
g(x) = -1/8 x + 2/8
g(x) = 1/8 (-x + 2)