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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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Do you have a “no-no” list?

No to not having a pet. We can't be a family if we are not going to keep a big fat orange cat or a g...