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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.
Examples- 4x4=16 so the Square Root of 16 is 4. 5x5=25 so the square root of 25 is 5. In general and more precisely, we say that r is the square root of a number m, if r2 â¦ =m. If r is positive, it is the principal square root. For example, both 4 and -4 when squared equal 16, but 4 is the principal square root.