Why is (n-1)(n+1)=n^2-1?
11.06.2025 17:07

The basic answer is that you cross-multiply the values in each factor:
n^2 - 1
xxx
If my lovely sister sleeps with my boyfriend, what should I do about her?
Move the nub up to the top:
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 x
Don't you think Democrats are so full of it stool softener and an enema couldn't help them?
(n - 1)(n + 1)
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
n^2 - n + n - 1
xxxx
And you are left with almost a square. One less than the square of side n.
How Dragonfly will support the search for life on an uninhabitable world - NASASpaceFlight.com -
So, that’s a rectangle with sides 2 and 4.
xxx
xx
20-Year Mystery of The Muon's Wiggle May Finally Be Solved - ScienceAlert
xxxx