Question

4+(√x-4)=x Решите уравнение

Answer 1

ОДЗ
x ≥ 4 

√(x - 4) = x - 4 
x - 4 = (x - 4)^2
x - 4 = x^2 - 8x + 16
x^2 - 8x + 16 - x + 4 = 0 
x^2 - 9x + 20 = 0 
D = 81 - 80 = 1
x1 = (9 + 1)/2 = 5;
x2 = (9 - 1)/2 = 4;

Ответ
4; 5