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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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As i was a kid. I was always alone (no friends). Everyone around me were already in schools getting...

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Is Tinder the best dating app?

Comments like this should be downvoted TBH. There is nothing in this post to suggest porn addiction...