Why is (n-1)(n+1)=n^2-1?
Last Updated: 16.06.2025 13:03
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
xxx
xxx
n^2 - n + n - 1
(n - 1)(n + 1)
xxx x
Why do some films seem to date/age so badly?
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:
Where did Noah build the Ark? Was it in a desert or near water?
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
And you are left with almost a square. One less than the square of side n.
n^2 - 1
Why do very skinny girls get more male attention if it is true that men like curves?
xxxx
Move the nub up to the top:
xxxx
xx