Rozwiąż równanie x3+3x2-9x-27=0
Stąd
lub
x3+3x2-9x-27=0
x²(x+3)-9(x+3)=0
(x²-9)(x+3)=0
(x-3)(x+3)(x+3)=0
x=3
x=-3
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Stąd
x3+3x2-9x-27=0
x²(x+3)-9(x+3)=0
(x²-9)(x+3)=0
(x-3)(x+3)(x+3)=0
x=3
x=-3