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-x³+x²
---------------
2x²-5x
-2x²+2x
--------------
-3x+3
3x-3
==============
(x-1)(x²+2x-3)=0
(x-1)(x²+3x-x-3)=0
(x-1)*[x(x+3)-(x+3)]=0
(x-1)(x+3)(x-1)=0
(x-1)²(x+3)=0
x-1=0 v x+3=0
x=1 v x=-3