Why is (n-1)(n+1)=n^2-1?
10.06.2025 02:30

n^2 - n + n - 1
(n - 1)(n + 1)
So, that’s a rectangle with sides 2 and 4.
Is the Democrat party connected with organized crime in America?
xxxx
The basic answer is that you cross-multiply the values in each factor:
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
xxx
And you are left with almost a square. One less than the square of side n.
Move the nub up to the top:
WWDC 2025: iOS 26 Rumored Features - MacRumors
xxx x
n^2 - 1
xx
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
xxxx
How to take pictures of the Northern Lights with Google Pixel and other Android phones - 9to5Google
xxx x