Question 198918
sol:
the Absolute value  |x| is defined as
|x|=x if x>0
   = -x if x<0
   =0 if x=0
in our problem the absolute value of -6=|-6|=-6 ;-6<0
the absolute value of -2=|-2|= -2;-2<0
[the absolute value of -6 ]-[absolute value of -2]
=|-6|-|-2|
= (-6)-(-2)
=-6+2= -4