Rozłóż na czynniki W(x) = x^3 - 5x^2 +4x -20
x^3-5x^2+4x-20=x^2(x-5)+4(x-5)=(x-5)(x^2+4)
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x^3-5x^2+4x-20=x^2(x-5)+4(x-5)=(x-5)(x^2+4)