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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 41 is NOT 12.... the square root of 144 is 12, because 12 squared is 144. If you want to deal with the square roots (or any root) of negative numbers... then you are dealing with imaginary numbers. CogitoErgoCogitoSum Â· 9 years ago.