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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 of a number is a value that, when multiplied by itself, gives the number. Example: 4 Ã 4 = 16, so a square root of 16 is 4. Note that (â4) Ã (â4) = 16 too, so â4 is also a square root of 16. The symbol is â which always means the positive square root.