Verified answer

- x³ + 3x - 2 = 0

x³ - 3x + 2 = 0

(x³ - 1) - (3x - 3) = 0

(x - 1)(x² + x + 1) - 3(x - 1) = 0

(x - 1)(x² + x + 1 - 3) = 0

(x - 1)(x² + x - 2) = 0

(x - 1)(x + 2)(x - 1) = 0

или x - 1 = 0   и тогда  x = 1

или x + 2 = 0  и тогда  x  = - 2

Ответ : - 2 ; 1