Why is (n-1)(n+1)=n^2-1?
11.06.2025 09:58

xxxx
xx
xxx
How do Flat Earthers explain time zones?
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
n^2 - 1
xxxx
Ryan Mountcastle To Miss 8-12 Weeks - MLB Trade Rumors
n^2 - n + n - 1
(n - 1)(n + 1)
So, that’s a rectangle with sides 2 and 4.
xxx x
The basic answer is that you cross-multiply the values in each factor:
xxx x
Rick Pitino 'Feels Bad' For Tom Thibodeau After Knicks Firing - Sports Illustrated
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.
Washington governor activates National Guard in search for accused killer, Travis Decker - KATU
Move the nub up to the top: