Posted by noahc on Sunday, February 24, 2013 at 4:46pm.
|x| is the absolute value function. It measures how far from zero x is, whether positive or negative.
|x| = x if x >= 0
That is, if x is not negative, |x| is just haw far away x is.
|x| = -x if x<0
So, if x is a negative value, |x| is still positive
Similarly, |x-10| is how far away from 10 x is.
So, |100| = 100
|-3| = 3
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