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

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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Is Beehiiv better than Substack?

I am not that familiar with Beehiiv but based on what I read I think it depends on your goal as a wr...