Question

x^3 + 2x^2 - x - 2 = 0

Answer 1

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Answer 2

Очевидно х-2 - корень.Поделим на (х+2).                                                                                 
х*х-1=0                                             
х*х=1                                                        
х=-1 или х=-1                                                          
Ответ? х=1, х=-1, х=-2.