Question

Решите уравнение x3 +5x2 −x−5=0.

Answer 1

x^2(x + 5) - (x+5) = 0

(x + 5)*(x^2-1) =0

(x + 5)*(x - 1)*(x + 1) = 0

x = -5      x = 1    x = -1