Why is (n-1)(n+1)=n^2-1?
16.06.2025 01:28
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
xxx
The basic answer is that you cross-multiply the values in each factor:
Why do very skinny girls get more male attention if it is true that men like curves?
(n - 1)(n + 1)
And you are left with almost a square. One less than the square of side n.
xx
Were you ever in love with your teacher?
So, that’s a rectangle with sides 2 and 4.
xxxx
n^2 - n + n - 1
xxx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
xxx x
Move the nub up to the top:
xxxx
xxx x
Do you want to have an XXX chat?
n^2 - 1