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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.
Finding the Square Root. Finding the square root of a number means looking at the whole square to determine the side length, meaning the number that was multiplied by itself. A square is presented under a radical sign.Without a calculator that has a radical button, you must know your multiplication facts to determine the square root.quaring Numbers. To square a number, multiply that number by itself. For example, 6 squared is 6 x 6 = 36. If you create a square with a side length of 6, you have 6 rows of 6. The total number of units in that square is 36. You express 6 squared as 6^2.