Absolute Value
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The absolute value of a number can be considered as the distance
between 0 and that number on the real number line.

 

Remember that distance is always a positive quantity (or zero). 
The distance in the diagram above from +4 to 0 is 4 units and the distance from -3 to 0 is 3 units.  These units are never negative values.

Using absolute value, we write this as:

 

The rule for computing absolute value is:

 

Examples:

 

 

 

 

See how to use your
TI-83+/84+ graphing calculator  with absolute value.
Click calculator.