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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 -...

How many couples swap wives?

Yes our first time was with an older couple we met had drinks we found we enjoyed similar things so...

Can men and women be friends?

Yes they will automatically be good friends after a hot and very sassy sex intercourse.if they love...