Question

Помогите пожалуйста z-9z^3=0

Answer 1

z - 9z^3 = 0
z • ( 1 - 9z^2 ) = 0
z • ( 1 - 3z ) • ( 1 + 3z ) = 0
z = 0
1 - 3z = 0
3z = 1
z = 1/3
1 + 3z = 0
3z = - 1
z = - 1/3
Ответ : 0 ; 1/3 ; - 1/3