х^3-х+2х^2-2= (x^3+2x^2)+(-x-2)=x^2*(x+2)-1*(x+2)=(x^2-1)*(x+2)
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х^3-х+2х^2-2= (x^3+2x^2)+(-x-2)=x^2*(x+2)-1*(x+2)=(x^2-1)*(x+2)