Why is (n-1)(n+1)=n^2-1?
16.06.2025 01:34

The basic answer is that you cross-multiply the values in each factor:
n^2 - 1
(n - 1)(n + 1)
How do teachers justify punishing a student for fighting back against their bullies?
n^2 - n + n - 1
xxx
xx
Fake flight attendant took 120 free flights before arrest at SFO, officials say - SFGATE
xxx
xxx x
And you are left with almost a square. One less than the square of side n.
What was the craziest place that you had sex with someone in public?
So, that’s a rectangle with sides 2 and 4.
Move the nub up to the top:
xxxx
xxx x
xxxx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
How can I decorate my house creatively?
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2