89
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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!!!!!
Press the square root button on your calculator.
The square root of 1225 is 35.
square root(105) = 10.2469508
The square root of 289 is ± 17.