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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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Hic perferendis in et impedit quo.

Corporis incidunt numquam dolor magnam aliquam quod repudiandae. Et vel voluptatem ducimus qui sunt...