Why is (n-1)(n+1)=n^2-1?
08.06.2025 05:33
xxxx
n^2 - n + n - 1
xxx x
xxxx
xxx
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
What is your biggest mistake or regret?
xx
(n - 1)(n + 1)
n^2 - 1
How do you know when your skirt is too short?
Move the nub up to the top:
The basic answer is that you cross-multiply the values in each factor:
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
If you were president, how would you make America "great again?"
xxx x
xxx
So, that’s a rectangle with sides 2 and 4.
The ‘golden summer of cheap flights’: Now’s the time for last-minute deals - CNN
And you are left with almost a square. One less than the square of side n.