Question 1142278
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1.  {{{sqrt(58780)}}} = 242.45  (aproximately).


2.  Take the number  242 and then square it:  {{{242^2}}} = 58564.


3.  Take the difference  58780 - 58564 = 216.



<U>ANSWER</U>.  The number you are asking for is 216.
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Solved.