Logo

Last Updated:

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 -...

Last Updated:

What smell will you never forget?

I’m a young Marine just finished his first enlistment and thought I’d try civilian life. Ended up, a...