Great prezi with the review of the properties of exponents:
https://prezi.com/xre3xbvvlfo8/chapter-4-properties-of-exponents/
How to simplify polynomials online:
MATHPORTAL http://www.mathportal.org/calculators/polynomials-solvers/polynomials-expanding-calculator.php
MATHPAPA http://www.mathpapa.com/free-algebra-calculator.html
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