## Intermediate Algebra (12th Edition)

The absolute value of a number is the distance between 0 and that number on a number line. In other words, the absolute value of a number represents how far that number is from 0 on the number line. The absolute value of a number $a$ is $a$ when $a\geq$0 and $-a$ when $a\lt0$. Therefore, $|4|=4$ and $|-4|=-(-4)=4$.