(х-1) (x-3)= x^2-3x-x+3=х^2-4x+3
(x^2-4x+3)(x+1)=x^3-4x^2+3x+x^2-4x+3=x^3-3x^2-x+3
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(х-1) (x-3)= x^2-3x-x+3=х^2-4x+3
(x^2-4x+3)(x+1)=x^3-4x^2+3x+x^2-4x+3=x^3-3x^2-x+3