Logo

Why is (n-1)(n+1)=n^2-1?

11.06.2025 00:06

Why is (n-1)(n+1)=n^2-1?

Move the nub up to the top:

If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2

xxxx

Why does a narcissist act like it's nothing when they hurt you?

xxx x

n^2 - n + n - 1

The basic answer is that you cross-multiply the values in each factor:

Harvey Weinstein Won’t Testify In His Own Defense In NYC Sex Crimes Retrial; Jury Deliberations May Start Tuesday - Deadline

xxx x

xxxx

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2

Feds poised to approve SpaceX’s takeover of another military launch pad - Ars Technica

xxx

(n - 1)(n + 1)

xxx

Have anyone had an relationship of any kind with a spirit or demon, such as a succubus? If so, how was it?

xx

And you are left with almost a square. One less than the square of side n.

n^2 - 1

Popular sugar substitute erythritol may impair brain blood vessel health, study finds - PsyPost

So, that’s a rectangle with sides 2 and 4.