Question

Решите уравнение
(х-5)(х+5)-х(5+х)=о

Answer 1

Ответ:

$(x + 5)(x - 5) - x(5 + x) = 0 \\ {x}^{2} - 25 - 25x - {x}^{2} = 0 \\ - 25 - 25x = 0 \\ - 25x = 25 \\ - x = 1 \: \: \: \: \: \: \: |( - 1) \\ x = - 1$