The top of the webpage is review of solving radical equations. Scroll to the middle of the page for Solving Equations with Rational Exponents.
http://www.mathwarehouse.com/algebra/exponents/equations/solve-exponential-equations-radical-in-exponent.php
http://www.mathwarehouse.com/geometry/parabola/square-root-function.php
http://www.youtube.com/watch?v=jPAasi50FGM
http://www.youtube.com/watch?v=XCKemxoS-T0
http://www.khanacademy.org/math/algebra/algebra-functions/graphing_functions/v/evaluating-functions