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sqrt(7921 = 89 per calculator
Mechanically we note that 7921 is near 8100.
NB sqrt(81) = 9 so it follows that sqrt(8100) = 90
Since
7921 is slightly less than 8100 then try a slightly lower number than 90.
So try 89
89x 89 = 89^2 - 7921
So it foilows that the sqrt( 7921) = 89 The Answer!!!!!
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89
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89
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