TR-MO-R1 2024 Problem 15

$x$ ve $y$ gerçel sayılar olmak üzere, $(x^2+1)(y^2+1)+129 = 12xy + 18(x+y)$ ise, $xy$ kaçtır?

a) $3$ b) $4$ c) $5$ d) $6$ e) $7$

Dataset text TÜBİTAK olympiad set, Matematik_2024_1.Asama_15. Quoted with source.

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