Why is (n-1)(n+1)=n^2-1?
12.06.2025 05:20

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
Move the nub up to the top:
(n - 1)(n + 1)
Who are some of the best Korean Actresses?
xxx x
n^2 - n + n - 1
n^2 - 1
Killer Inn is Square Enix’s new ‘murder mystery action’ game - The Verge
xxx x
And you are left with almost a square. One less than the square of side n.
The basic answer is that you cross-multiply the values in each factor:
xxxx
So, that’s a rectangle with sides 2 and 4.
xxxx
xxx
xx
xxx
Are miracles real or do they just have natural explanations?
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2