During week 3, I learned about the Absolute Value of a Real Number. The absolute value of a real number is the principal square root of its square or its distance from zero on a number line. The principal square root is the positive square root. The two lines “||” before and after the numbers represent absolute value.

Example: |4 – 7|  =  |-3|  =  3

*If there is a negative number outside of the “paratheses”, the answer can be negative. If there is no negative number in front of it, it has to be positive.