Here are a few videos to help you understand negative exponenets better!! Just remember, if you have a negative exponent, it is the same as 1 over a positive exponent. Enjoy!!!!
http://mathvids.com/lesson/mathhelp/791-negative-exponents-part-1
http://www.khanacademy.org/math/algebra/exponents-radicals/v/negative-exponent-intuition
http://www.schooltube.com/video/a16a9991c2d8661e51d1/
IF YOU ARE STILL STRUGGLING WITH 8.1 AND 8.2 WATCH THESE!!!
http://www.schooltube.com/video/5a69ca011849dc729374/
http://www.schooltube.com/video/c4b4298195cccaf8a308/
