Question

решите уравнение
x^4-25x^2=0

Answer 1

$x^{4} - 25 x^{2} = 0 \ x^{2}(x^{2} - 25)= 0 \ x^{2}(x - 5)(x +5)= 0 \ x^{2} = 0 => x= 0\ x - 5= 0 => x= 5\ x +5= 0 => x= -5$

Ответ:  -5 ; 0 ; 5.