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 -...
The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...
Because it was designed and tested not to do so. It is not a balloon. Just like my car tires are not...
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