Why is (n-1)(n+1)=n^2-1?
Last Updated: 25.06.2025 08:06
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
So, that’s a rectangle with sides 2 and 4.
xxx
xxx x
xxx x
xx
Chiefs trivia: Your in-5 daily game, Friday edition - Arrowhead Pride
The basic answer is that you cross-multiply the values in each factor:
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2
n^2 - 1
How can reading fiction be turned from escapism into personal growth?
Move the nub up to the top:
n^2 - n + n - 1
xxxx
What are some “hard to swallow” facts about K-pop?
(n - 1)(n + 1)
xxxx
xxx
And you are left with almost a square. One less than the square of side n.