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 -...
American gymnastics icon Mary Lou Retton entered a no contest plea to driving under the influence st...
These are just some observations from an allergist, not science. I have no education. And a long exp...
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