Найдите корень уравнения 1) x^3 - (x-3) (x^2+3x+9) + 9x=-18x

X³ - (x - 3) (x² + 3x + 9) + 9x = - 18x

x³ - (x³ + 3x² + 9x - 3x² - 9x - 27) + 9x + 18x = 0

x³ - (x³ - 27) + 27x = 0

x³ - x³ + 27 + 27x = 0

27 (x + 1) = 0

x + 1 = 0

x = - 1.

Ответ: x = - 1.