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Wielomian jest podzielny przez (x-1)
W(x)=x³(x-1)+2x²(x-1)-4x(x-1)-8(x-1)=
(x-1)(x³+2x²-4x-8) = (x-1) * [ x²(x+2) - 4(x+2)]=
(x-1)(x+2)(x²-4)= (x-1)(x+2)(x+2)(x-2)