х(х² + 6x + 9) = 4(x + 3)
x(x + 3)² - 4(x + 3) = 0
(x + 3)(x(x + 3) - 4) = 0
(x + 3)(x² + 3x - 4) = 0
x² + 3x - 4 = 0 или x + 3 = 0
D = 3² - 4 * (-4) * 1 = 9 + 16 = 25 = 5² x = -3
ответ: -4; -3; 1
