Why is (n-1)(n+1)=n^2-1?
09.06.2025 11:46

n^2 - 1
(n - 1)(n + 1)
The basic answer is that you cross-multiply the values in each factor:
What do porn stars do when they get old?
So, that’s a rectangle with sides 2 and 4.
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
xxxx
Why do so many autistic adults deal with self-hatred?
xxx
And you are left with almost a square. One less than the square of side n.
xxx x
Why do I feel so tired all the time even after a good night’s sleep?
xx
xxx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
Resident Evil 9, Requiem, Announced At Summer Game Fest With Trailer And Release Date - GameSpot
xxxx
xxx x
Move the nub up to the top:
n^2 - n + n - 1