Answer:

x1 = -2 x2 = -1 x3 = 1

Step-by-step explanation:

x³ + 2x² - x - 2 = 0

x² × (x + 2) - x - 2 = 0

x² × (x + 2) - (x + 2) = 0

(x + 2) × (x² - 1) = 0

x + 2 = 0

x² - 1 = 0

x = -2

x² - 1 = 0

x = -2 x = -1 x = 1

x1 = -2 x2 = -1 x3 = 1