x³+2x²-9x-18=0
(x³+2x²)+(-9x-18)=0
x²•(x+2)-9•(x+2)=0
(x+2)•(x²-9)=0
(x+2)•(x-3)•(x+3)=0
x=-2 x=3 x=-3
Ответ: -2; 3; -3
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x³+2x²-9x-18=0
(x³+2x²)+(-9x-18)=0
x²•(x+2)-9•(x+2)=0
(x+2)•(x²-9)=0
(x+2)•(x-3)•(x+3)=0
x=-2 x=3 x=-3
Ответ: -2; 3; -3