Why is (n-1)(n+1)=n^2-1?
10.06.2025 07:13

If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
So, that’s a rectangle with sides 2 and 4.
xxxx
xxxx
n^2 - 1
And you are left with almost a square. One less than the square of side n.
Why are people nowadays so into anal sex?
xxx
xxx x
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
My Girlfriend Had a Legendary Sex Life Before Me. No One Will Let Me Forget It. - Slate Magazine
(n - 1)(n + 1)
xxx
Move the nub up to the top:
2025 U.S. Nationals: Day 2 Prelims Live Recap - SwimSwam
xxx x
The basic answer is that you cross-multiply the values in each factor:
xx
Why do I (45, male) feel like I'm crushing on a girl (19, female)?
n^2 - n + n - 1