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Every nonnegative real number a has a unique nonnegative square root, called the principal square root, which is denoted by √a, where √ is called the radical sign or radix. For example, the principal square root of 9 is 3, denoted √9 = 3, because 32 = 3. • 3 = 9 and 3 is nonnegative.

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"Square Root Calculator" Math.net. STANDS4 LLC, 2017. Web. 15 Dec. 2017. <http://www.math.net/calculators/square-root>.

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