√(26+5x) - 4 - x = 0
(√(26+5x))² = (x+4)²
26+5x = x² + 8x + 16
x² + 3x - 10 = 0
D = 9 + 40 = 49
x1,2 = -3-+7/2
x1 = -5 x2 = 2
проверка:
1) √26+5*(-5) - 4 - (-5) = 0
√26-25 - 4 + 5 = 0
1 - 1 = 0
0 = 0
2) √26+5*2 - 4 - 2 = 0
√26+10 - 6 = 0
√36 - 6 = 0
6 - 6 = 0
0 = 0
ответь: (-5;2)