x (x+4.3) (1.8-x) = 0

(x² + 4.3x) (1.8-x) = 0

1.8x² - x³ + 7.74x - 4.3x² = 0

x³ + 2.5x² - 7.74x = 0

x² + 2.5x - 7.74 = 0

D = b² - 4ac = 6.25 + 30.96 = 37.21

√D = 6.1

x = (-b ± √D) / 2a

x1 = (-2.5 + 6.1) / 2 = 3.6 / 2 = 1.8

x2 = (-2.5 - 6.1) / 2 = -8.6 / 2 = -4.3

Ответ: -4.3 , 1.8