2) | x + 2 | - 4
--------------- = 2
| x | - 1
| x + 2 | - 4 = x +2 - 4 = x - 2
| x | - 1 = x - 1
x - 2 - 2
------ = ------ = 2
x - 1 - 1
2 = 2
3) | x - 6 | = | x^2 - 5x +9 |
x - 6 = x^2 - 5x + 9
x - x^2 + 5x = 9 + 6
6x - x^2 = 15
- x^2 + 6x -15 = 0
a = -2
b = 6
c = -15
D = b^2 - 4 × ac
D = 36 + 120
D = 156
в 3 пункте есть сомнения