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If the square root is not a Perfect Square then it is an Irrational Number, and can not be exact beyond the term √a. For example:
√9 = +-3 it can be reduced to a number.
√8 is it's most exact when left as that, if you wanted to get a decimal it would depend on how many places you want to round.
2.828427125
Or you can write it as 2 < √8 < 3
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