Answer :

AL2006

When you square  +6  or  -6  you get  36.  That's less than  40.

When you square  +7  or  -7, you get  49.  That's more than  40.

So one of the square roots of  40  is between  +6  and  +7, and
the other square root of  40  is between  -7  and  -6 .


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