Răspuns:
x^2+x-2=
x^2+2x-x-2=
x x(x+2)-(x+2)=
(x+2)x(x-1)
x²+x-2=x²+2x-x-2=x(x+2)-x-2=x(x+2)-(x+2)=(x+2)(x-1)