Staff Review
This lesson revisits the idea of taking an even root of a variable to an even exponent. This time, we will no longer assume that the variable is positive. Therefore, absolute value signs are used to force the answer to be positive. Some very good ideas are covered and explained in this lesson. This idea of writing an absolute value sign in the solution to a radical expression is very important and can be very confusing. This is a must-watch for this concept.