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Principal Square Root. The unique nonnegative square root of a nonnegative real number. For example, the principal square root of 9 is 3, although both and 3 are square roots of 9.
The square root (r) of a number (y) is that number which multiplied by itself gives the original number, ie: if r = ây, then y = r Ã r = rÂ². Every nu â¦ mber has two square roots as a negative number multiplied by a negative number is a positive number.