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.

This video is courtesy of Yay Math! (YouTube)

Citation styles

APA style
How Do You Simplify Radical Expressions?. (2013, March 2). In ClassBrain Math Tutorials. Retrieved 15:26, March 25, 2017, from http://www.classbrainmath.com/simplify-radical-expressions/
MLA style
Cynthia Kirkeby, “How Do You Simplify Radical Expressions?.” ClassBrain Math Tutorials. 2 March 2013, 09:57 UTC. . 25 Mar 2017 <http://www.classbrainmath.com/simplify-radical-expressions/>.
MHRA style
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 25 March 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 March 25, 2017].
CBE/CSE style
Cynthia Kirkeby, How Do You Simplify Radical Expressions? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 09:57 UTC [cited 2017 Mar 25]. Available from: http://www.classbrainmath.com/simplify-radical-expressions/.
Bluebook style
How Do You Simplify Radical Expressions?, http://www.classbrainmath.com/simplify-radical-expressions/ (last visited Mar. 25, 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 March 25, 2017.