Why is (n-1)(n+1)=n^2-1?

2025 U.S. Nationals: Day 2 Prelims Live Recap - SwimSwam

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The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...

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Read through for a few things that were seen and heard during Day 2 of minicamp practice.