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This is an other very easy question but most of us not know the basic concept of square root.
Every positive number has two sqare roots. One is positive and other is negative.
The square root of 25 means
+ \/25 and - \/25
In given above question it is already given positive square root. So here we should not use negative or positive sign. It is already poistive square root.
The word square root means positive square root and negative square root.
But the symbol \/
is use for positive square root. And positive square root is also called Principal Square Root.