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MathIsFun: Algebra Squares and Square Roots VirtualNerd: Adding and Subtracting Radicals 

MathIsFun: Simplifying Square Roots VirtualNerd: Graphing Square Root Functions 

Medium: Fast Ways to Simplify Radicals VirtualNerd: Solving Radical Equations 

VarsityTutors: Common Factors of Square Roots VirtualNerd: Using the Pythagorean Theorem

VirtualNerd: Radicals Basics VirtualNerd: Distance and Midpoint Formulas 

VirtualNerd: Simplifying Radical Expressions Wyzant: Square Roots and Radicals