\hspace{-16}$How many Integer $\mathbf{n}$ are there such that $\mathbf{n+20}$ and $\mathbf{n-20}$ are Perfect Squares\\\\
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2 Answers
Arnab Kundu
·2012-01-01 06:14:25
Let n+20=k2 and n-20=l2
(k+l)(k-l)=40
So, solutions are n=29 and 101
Ans.2