Why is (n-1)(n+1)=n^2-1?
11.06.2025 05:11
xxx x
xxx
xxxx
Higher-Earning Shoppers Hit the Dollar Store as Spending Tightens - WSJ
n^2 - n + n - 1
xxxx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
What Your Sweat Could Reveal About Your Health - CNN
n^2 - 1
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
So, that’s a rectangle with sides 2 and 4.
Is a man over 50 not married no kids a red flag?
And you are left with almost a square. One less than the square of side n.
Move the nub up to the top:
xxx
The basic answer is that you cross-multiply the values in each factor:
xxx x
xx
'Mission: Impossible 8': Inside How They Shot Underwater Submarine - IndieWire
(n - 1)(n + 1)