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6K views · 650 reactions | The Surprising Pattern Hidden in This Messy Square Root √((89)(90)(91)(92) + 1) looks like something you’d need a calculator for. But if you spot the pattern, it collapses beautifully. Let the middle number be x. Then the others are x−1, x, x+1, x+2. Multiply, regroup, and it all simplifies to x² + x − 1. For x = 90, that’s 8,189 — no calculator required. #AlgebraTricks #MathShortcuts #PatternRecognition | polymathematic | Facebook

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