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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*ClassBrain Math Tutorials*, 2 March 2013, 09:57 UTC, <http://www.classbrainmath.com/simplify-radical-expressions/> [accessed 26 April 2017] - The Chicago Manual of Style
- Cynthia Kirkeby, “How Do You Simplify Radical Expressions?.”
*ClassBrain Math Tutorials*, http://www.classbrainmath.com/simplify-radical-expressions/ [accessed April 26, 2017]. - CBE/CSE style
- Cynthia Kirkeby, How Do You Simplify Radical Expressions? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 09:57 UTC [cited 2017 Apr 26]. Available from: http://www.classbrainmath.com/simplify-radical-expressions/.
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- 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 April 26, 2017.