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Автор - pavlova189

Решите уравнения и неравенства используя разложение многочленов на множители. х³+2х²-х-2=0 ПОМОГИТЕ ПОЖАЛУЙСТА

Ответ

Автор - saltony94

 {x}^{3}  + 2 {x}^{2}  - x - 2 = 0 \  {x}^{2} (x + 2) - (x + 2) = 0 \ ( {x}^{2}  - 1)(x + 2) = 0 \ (x - 1)(x + 1)(x + 2) = 0 \ x = 1 \ x =  - 1 \ x =  - 2

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