F(x)=x2+2x/x-1 ?????

Question

F(x)=x2+2x/x-1 ?????

Answer 1

(2х+1)'(x-1)-(x-1)'(2x+1)\(x-1)^2=2(x-1)-(2x+1)\(x-1)^2=
=2x-1-2x-1\(x-1)^2=-2\(x-1)^2