Question

помогите решить уравнение!!!!!!!!!!!!

Answer 1

√(x^2 - 1 ) = 1 - x

ОДЗ
x ≤ 1 

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

Ответ
1