Jika (fog)((x)= 10x-8 dan g(x)= 2x+4 maka f^-1(x)= A.5x+28 B.5x-28 C.x+28 D.x+14/2 E.x+28/5

(fog) (x) = 10x - 8
f(g(x)) = 10x - 8
f(2x + 4) = 10x - 8
misal 2x + 4 = p maka x = (p - 4) / 2
f(p) = 10( (p - 4) / 2) -8
f(p) = 5(p - 4) - 8
f(p) = 5p - 20 - 8
f(x) = 5x - 28
y = 5x - 28
5x = y + 28
x = (y + 28) / 5
f(x) -¹ = (x + 28) / 5