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Math Planet
Math Planet: Radical Expressions: Simplify Radical Expressions
How to simplify radical expressions is explained through the use of examples and a video lesson. [2:29]
Khan Academy
Khan Academy: Properties of Exponents Challenge (Rational Exponents)
Rewrite some elaborate exponential expressions that involve fractional exponents and radicals. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.