g(x)= 2x+1, invers fog(x)= -6x+5/2x-2, invers fungsi f adalah...

Misalkan:
2x+1=y
2x= y-1
x= y-1/2
fog(x)= f(g(x)
-6x+5/2x-2 = f( 2x+1)
-6( y-1/2)+5 / 2(y-1/2)-2 = f(y)
-3y+3+5 / y-1-2 =f(y) di bagi 2
-3y+8/y-3 = f(y)
f(x) =-3x +8/x-3