Why is (n-1)(n+1)=n^2-1?
Last Updated: 27.06.2025 07:04

xxx x
xxx x
So, that’s a rectangle with sides 2 and 4.
JWST captures its most extreme gravitational lens ever - Big Think
And you are left with almost a square. One less than the square of side n.
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 - n + n - 1
The basic answer is that you cross-multiply the values in each factor:
(n - 1)(n + 1)
xxx
May 2024 solar storm cost $500 million in damages to farmers, new study reveals - Space
n^2 - 1
xxxx
xxx
Why are Republican politicians so afraid to oppose Trump?
xxxx
xx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
Move the nub up to the top: