Question

find the least number which must be added to 7900 to obtain a perfect square.

plz help me guys...
it's urgent.........
Have a nice day...........​

Answer 1

$Given \:number \: 7900$

8 | 7900|89

×8|64

________

169| 1500

× 9 | 1521

________

******* (-21)

Therefore.,

We should add 21 to 7900 to make it perfect square.

89² = 7921

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