To avoid this technicality many textbooks state, at this point, that we assume all variables are positive. If not, use the absolute values as in the following problems.

**Simplify.**

*(Assume variables could be negative.)*To avoid many of the technicalities when working with nth roots we will assume, from this point on, that all the variables are positive.

**Simplify.**

*(Assume all variables represent positive numbers.)*
Students often try to simplify the previous problem. Be sure to understand what makes the following problems all different.

The property:

says that we can simplify when the operation is multiplication. There is no corresponding property for addition or subtraction.**Video Examples on YouTube:**