Question

x^3+5x^2−x−5 равно нулю

Answer 1

x^3 + 5x^2 - x - 5 = 0 
x^2(x + 5) - 1 (x + 5) = 0 
(x^2 - 1) (x + 5) = 0 

x^2 - 1 = 0 
x^2 = 1 
x = ± √1
x = ± 1

x + 5 = 0 
x = - 5 

Ответ:
- 5; - 1; 1