0
The absolute value of a number is the number without the effect of its sign. It can be represented by putting a vertical line either side of the number.
e.g.
|5-8| = 3
|-2| = 2
the general rule for this is:
|a| = sqrt(a^2)
This is because when you square any number, the result is ALWAYS positive. 0^2 = 0 though.
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