Why is (n-1)(n+1)=n^2-1?
Last Updated: 18.06.2025 10:36
(n - 1)(n + 1)
xxx x
n^2 - n + n - 1
Air India plane crash death toll rises to 270 - BBC
xxx
n^2 - 1
The basic answer is that you cross-multiply the values in each factor:
Trump must stop the AI bloodbath before it’s too late - The Hill
Move the nub up to the top:
And you are left with almost a square. One less than the square of side n.
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
xxx x
Have husbands and wives ever had a threesome with someone in real life? How did it happen?
So, that’s a rectangle with sides 2 and 4.
xx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
If freedom of speech is absolute, how come it's not applied for private spaces and for the Internet?
xxxx