Question

решите уравнение: x3+3x2-9x-27=0

Answer 1

( x^3 + 3x^2) - 9(x + 3) = 0
x^2( x + 3) - 9( x + 3) = 0
(x + 3)(x^2 - 9) = 0
( x + 3)(x - 3)(x + 3) = 0
( x + 3)^2(x - 3) = 0
x + 3 = 0
x = - 3
x - 3 = 0
x = 3
Ответ:x1 = - 3, x2 = 3.