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Автор - KoPacuK

Решите уравнение x³+2x²-9x-18=0​

Ответ

Автор - chernichnoe
ОТВЕТ ПОДАЛА НА ФОТО, ЕСЛИ НЕ ПОЙМЁШЬ, ПИШИ

Ответ

Автор - CandySweet2019

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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