diketahui f(x)=x-3 dan g(x)=2x+4,maka (g•f)-¹(2)=...

1. (gof)(x)
= g(f(x))
= 2.(x-3) + 4
= 2x - 6 + 4
= 2x-2

y = 2x-2
y+2 = 2x
x = (y+2)/2
(gof)^-1(x) = (x+2)/2
(gof)^-1(2) = (2+2)/2
(gof)^-1(2) = 2