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Mathwords: Square Root

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Square Root

A nonnegative number that must be multiplied times itself to equal a given number. The square root of x is written or x^½. For example, since 3² = 9.

Note: never refers to a negative number. Even though (–3)(–3) = 9, we do not say that –3 is a value of . Also, if x itself is negative then is imaginary.