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SMO 2014 Senior Round 1 Question 23

SMO · SMO 2014 Senior Round 1

Question 23

Let $n$ be a positive integer, and let $$x=\frac{\sqrt{n+2}-\sqrt n}{\sqrt{n+2}+\sqrt n}\quad\text{and}\quad y=\frac{\sqrt{n+2}+\sqrt n}{\sqrt{n+2}-\sqrt n}.$$ It is given that $14x^2+26xy+14y^2=2014$. Find the value of $n$.