Ответ:

[tex] {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[/tex]