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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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Culpa maxime qui ut ut aut in.

Et fugit qui aliquam recusandae molestias velit cum. Omnis dolorem nisi accusantium aut. Nulla omnis...

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Why do you write?

Me - Why do I write? My dairy - You have alot of friends but you don't vent in front of anyone that'...