You get the same number.
For example:
The square root of 9 is 3.
32 = 9
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You get back to the number which the square root relates to. i.e. The square root of 16 is 4. 4 times 4 is 16.
The square root is the number which is times by itself, to get the square number.
the square root of a number is the number that is multiplied by itself to get that number, for example the square root of 9 is 3
Nothing. You cannot have a square root of a negative number. The square root of negative one is called i, but i is an imaginary number. It does not exist and does not follow the properties of real numbers. (For example, if a and b are positive, then the square root of a times the square root of b is the square root of ab. But the square root of -7 is not the square root of 7 times i.)
The square root of a negative number is not real.