Because there is no "real" sqrt of a negative number, i is used as a symbol, eg sqrt -4 = 2i
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Negative square root is -√Square root of negative one is i.
Mathematicians decided that, since the square root of a negative number does not exist, they would use the first letter of "imaginary" to represent this "value".
It is just a notation, used to make our calculations easier. Square root of -1 is undefined.
The square root of 1/9 is 1/3 because the square root of 1 is 1 and the square root of 9 is 3.
To find the square root of a quarter, you can use the formula for square roots. The square root of a number x is a number that, when multiplied by itself, gives x. In this case, the square root of 1/4 (a quarter) is 1/2, because (1/2) * (1/2) = 1/4. Therefore, the square root of a quarter is 1/2.