x^2+2x-1=x-1
x^2+2x-1-x+1=0
x^2+x=0
x(x+1)=0
x1=0 x2=-1
y(0)= 0^2-2*0-1 = -1
y(-1)= (-1)^2 - 2*(-1)-1 = -2
(0;-1); (-1;-2)
x^2+2x-1=x-1
x^2+2x-1-x+1=0
x^2+x=0
x(x+1)=0
x1=0 x2=-1
y(0)= 0^2-2*0-1 = -1
y(-1)= (-1)^2 - 2*(-1)-1 = -2
(0;-1); (-1;-2)