Answer:
The absolute value is always equal to the module (or positive value) of a number:
IxI = x if x>0
IxI = -x if x < 0
suppose you have an addition of two numbers of the same sign:
If both numbers are positive, the sum will be positive, if both numbers are negative, the sum will be negative, but now let's see the case where the sign of the numbers is different:
Here, you can apply the absolute value to both numbers, and the sign of the addition will be the same sign of the number associated with the biggest absolute value.
