x³ + 7x² - 9x - 63 = 0
x²(x + 7) - 9(x + 7) = 0
(x + 7)(x² - 9) = 0
x + 7 = 0
x₁ = -7
x² - 9 = 0
x² = 9
x = ±√9
x₂ = 3 x₃ = -3
ответ: -7; 3; -3
x³ + 7x² - 9x - 63 = 0
x²(x + 7) - 9(x + 7) = 0
(x + 7)(x² - 9) = 0
x + 7 = 0
x₁ = -7
x² - 9 = 0
x² = 9
x = ±√9
x₂ = 3 x₃ = -3
ответ: -7; 3; -3