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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 the number that must be multiplied by itself to get that number. if y is a number then the solution to the equation y=x^2 is the square root of y. 2 people found this useful. Answered.