jika(f°g)(x)=10x-8 dan g(x)=2x+4 maka f-¹(x)

Materi : Fungsi Komposisi
             Fungsi Invers


fog(x) = 10x - 8
g(x) = 2x + 4

f(g(x)) = 10x - 8
f(2x + 4) = 10x - 8
f(x) = 10([x-4]/2) - 8
f(x) = 5(x - 4) - 8
f(x) = 5x - 28

y = 5x - 28
y + 28 = 5x
[y + 28]/5 = x

jadi f⁻¹(x) = (x + 28)/5