Step-by-Step Guide: How to Determine the Domain of This Function

A black-and-white image displays a complex mathematical set notation defining r₁ as pairs of integers (x, y) where y equals (5x² + 4) divided by (x² + 2). The text is written in a standard serif font on a plain white background. The joke relies on the fact that this equation, while appearing complex, simplifies to y = 5 for all integer x values, making the set r₁ simply {(x, 5) | x ∈ Z}, which is a horizontal line at y=5.

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