2x(x + 20)² - x²(x + 20) = 0
(x + 20)(2x(x + 20) - x²) = 0
(x + 20)(2x² + 40x - x²) = 0
(x + 20)(x² + 40x) = 0
x + 20 = 0 или x² + 40x = 0
x = -20 x(x + 40) = 0
x = 0 или x + 40 = 0
x = -40
|-40| = 40
|-20| = 20
ответ: 0; -20; -40
2x(x + 20)² - x²(x + 20) = 0
(x + 20)(2x(x + 20) - x²) = 0
(x + 20)(2x² + 40x - x²) = 0
(x + 20)(x² + 40x) = 0
x + 20 = 0 или x² + 40x = 0
x = -20 x(x + 40) = 0
x = 0 или x + 40 = 0
x = -40
|-40| = 40
|-20| = 20
ответ: 0; -20; -40