Why is (n-1)(n+1)=n^2-1?
Last Updated: 16.06.2025 23:57

n^2 - n + n - 1
xxx
n^2 - 1
(n - 1)(n + 1)
xxx
And you are left with almost a square. One less than the square of side n.
What defines the k'vanna of the Book of בראשית?
So, that’s a rectangle with sides 2 and 4.
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:
What happens when you need emergency surgery in countries with universal healthcare vs the US?
xxxx
xxx x
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
I supercharged Google search with a three-key shortcut with custom results - Android Police
xxx x
xxxx
The basic answer is that you cross-multiply the values in each factor:
xx