02.1 Simplify Expressions with Exponents, More Diffic-Section 4.2
Simplify expressions with exponents and just two variables.
For video explanation of the topic, go to
https://www.khanacademy.org/math/arithmetic/exponents-radicals/negative-exponents-tutorial/v/negative-exponents.
Videos with negative exponents at
http://patrickjmt.com/exponents-simplifying-expressions-with-negative-exponents-ex-1/
or http://patrickjmt.com/exponents-simplifying-expressions-with-negative-exponents-ex-2/
or http://patrickjmt.com/exponents-simplifying-expressions-with-negative-exponents-ex-3/