When simplifying square roots, we give the positive and negative answer if solving an equation that did not originally have a square root. Otherwise, we give only the principal root. Square roots of negative numbers have non-real answers, which is why square roots of variables sometimes include the condition that the variable is greater than zero. Knowledge of math radicals is important when solving quadratic equation problems.

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How Do You Simplify Radical Expressions?. (2013, March 2). In ClassBrain Math Tutorials. Retrieved 06:24, July 22, 2017, from http://www.classbrainmath.com/simplify-radical-expressions/
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Cynthia Kirkeby, “How Do You Simplify Radical Expressions?.” ClassBrain Math Tutorials. 2 March 2013, 09:57 UTC. . 22 Jul 2017 <http://www.classbrainmath.com/simplify-radical-expressions/>.
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Cynthia Kirkeby, 'How Do You Simplify Radical Expressions?', ClassBrain Math Tutorials, 2 March 2013, 09:57 UTC, <http://www.classbrainmath.com/simplify-radical-expressions/> [accessed 22 July 2017]
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Cynthia Kirkeby, “How Do You Simplify Radical Expressions?.” ClassBrain Math Tutorials, http://www.classbrainmath.com/simplify-radical-expressions/ [accessed July 22, 2017].
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Cynthia Kirkeby, How Do You Simplify Radical Expressions? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 09:57 UTC [cited 2017 Jul 22]. Available from: http://www.classbrainmath.com/simplify-radical-expressions/.
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How Do You Simplify Radical Expressions?, http://www.classbrainmath.com/simplify-radical-expressions/ (last visited Jul. 22, 2017).
AMA style
Cynthia Kirkeby, How Do You Simplify Radical Expressions?. ClassBrain Math Tutorials. March 2, 2013, 09:57 UTC. Available at: http://www.classbrainmath.com/simplify-radical-expressions/. Accessed July 22, 2017.