Why is (n-1)(n+1)=n^2-1?
Last Updated: 16.06.2025 05:01

xx
(n - 1)(n + 1)
n^2 - 1
Adam Scott, nearly 45 years old, with chance to redefine career on U.S. Open Sunday - NBC Sports
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
And you are left with almost a square. One less than the square of side n.
xxx
What would explain Trump blaming Ukraine for starting the war with Russia?
xxxx
xxx
So, that’s a rectangle with sides 2 and 4.
What was your biggest culture shock going to Europe?
n^2 - n + n - 1
xxx x
xxx x
Move the nub up to the top:
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
This Week In Space podcast: Episode 165 — Guardians of Space - Space
The basic answer is that you cross-multiply the values in each factor: