Why is (n-1)(n+1)=n^2-1?
12.06.2025 03:46
The basic answer is that you cross-multiply the values in each factor:
xxxx
n^2 - n + n - 1
Is modular building a fix for NY's housing crisis? State officials hope so. - Gothamist
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
xx
And you are left with almost a square. One less than the square of side n.
Can bosses get fired for being too hard on employees?
xxx x
(n - 1)(n + 1)
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
Major US retailers cancel Nintendo Switch 2 pre-orders - GamesIndustry.biz
xxx
xxx x
xxx
Move the nub up to the top:
xxxx
n^2 - 1
What is your juiciest sex story?
So, that’s a rectangle with sides 2 and 4.