x³+3x²-9x-27=0
x²(x+3)-9(x+3)=0
(x+3)(x²-9)=0
(x+3)(x-3)(x+3)=0
x1=-3 v x2=3
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x³+3x²-9x-27=0
x²(x+3)-9(x+3)=0
(x+3)(x²-9)=0
(x+3)(x-3)(x+3)=0
x1=-3 v x2=3