So you're dealing with absolute value which means that whatever is inside these symbols | | will be positive after all the calculations inside are done.
Plug in your values
|(-2) + (-6)|/2
-2 - 6 = -8
absolute value of -8 is 8
8/2 = 4
First part is 4
|(-2) - (-6)|/2
-2 + 6 = 4
4/2 = 2
Second part is 2
Put the two values back into your original equation
(From top to bottom) wrong, right, right, right, wrong. This is because a irrational*an irrational number is rational, but a rational*an irrational is an irrational number
