Why is (n-1)(n+1)=n^2-1?
12.06.2025 08:18

(n - 1)(n + 1)
xxx x
The basic answer is that you cross-multiply the values in each factor:
Has a psychic ever made a crazy prediction that turned out to be true?
xx
xxx
So, that’s a rectangle with sides 2 and 4.
Why are men today so pussiefied?
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
xxx
n^2 - n + n - 1
How Can AI Researchers Save Energy? By Going Backward. - Quanta Magazine
Move the nub up to the top:
xxxx
And you are left with almost a square. One less than the square of side n.
Why does my sister want to have sex with me? What should I do?
xxxx
xxx x
n^2 - 1
R.I.P Loretta Swit: How well do you remember ''Hot Lips'' Houlihan? - MeTV
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2