# Definition for Absolute Value

### If a is a real number, then the absolute value of a is:

$\left&space;|&space;a&space;\right&space;|=&space;\left\{\begin{matrix}&space;a&space;\\&space;-a&space;\end{matrix}\right.$        $\begin{matrix}&space;if&space;a\geq&space;0\\if&space;a<0&space;\end{matrix}$

### Properties of Absolute Values

#### Watch these free videos and review the concepts of order on the number line and absolute value.

Filed under: Pre-requisites for Pre-Calculus

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