Решить уравнение: х^3+4х^2=9х+36

Question

Решить уравнение: х^3+4х^2=9х+36

Answer 1

X^3+ 4x^2 = 9x + 36
x^3 + 4x^2 -9x - 36 = 0
x^2(x + 4) -9(x + 4) = 0
(x + 4)(x^2 - 9) = 0
(x + 4)(x-3)(x + 3) = 0
x_1 = -4
x_2 = 3
x_3 = -3