What the square root of 7921 in simplify?

Answer 1

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!!!!!