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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.
Principal Square Root. But, from a practical standpoint, what we are really asking is, what is the positive number square root, the positive number square root is the Principal Square Root. Remember, when a negative number is multiplied by itself (also a negative number) the product is positive.