8-6: solving radical equations: http://youtu.be/4xV-03vWKv8
8-7:complex numbers: https://www.youtube.com/watch?v=lBcWOuJ4GPk&feature=youtu.be
more on complex numbers: https://www.youtube.com/watch?v=J0UaCUQuSEo&feature=youtu.be
properties of exponents: https://www.youtube.com/watch?v=s3O3lhnkq88
simplifying radicals: http://www.youtube.com/watch?v=JUTFUNdD8rM
simplifying nth root: http://www.youtube.com/watch?v=va7WUdLyq0I
radical operations: http://www.youtube.com/watch?v=BbZdnZnjH7Q
fractional exponents: http://www.youtube.com/watch?v=1OdxOZcNhSQ
solving rational exponent equations: http://youtu.be/frELwaqeCfU