Why is (n-1)(n+1)=n^2-1?
10.06.2025 12:42
xxx
And you are left with almost a square. One less than the square of side n.
xxxx
(n - 1)(n + 1)
Move the nub up to the top:
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
Procter & Gamble to Cut 7,000 Jobs - WSJ
xxxx
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
The basic answer is that you cross-multiply the values in each factor:
Is Veuve Clicquot Brut a good champagne?
xxx x
n^2 - 1
xx
How are you spending your best time?
So, that’s a rectangle with sides 2 and 4.
xxx x
n^2 - n + n - 1
What's the difference between “ce”, “ça”, and “cela”, and when do I use each (French)?
xxx