Why is (n-1)(n+1)=n^2-1?
Last Updated: 17.06.2025 04:52

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.
The basic answer is that you cross-multiply the values in each factor:
What should I do if a girl whom I love asks me to be her friend?
n^2 - 1
xxx x
xxx x
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
And you are left with almost a square. One less than the square of side n.
What is your worst experience in life?
xxx
(n - 1)(n + 1)
xxxx
xx
Move the nub up to the top:
xxxx
How safe is it to travel to Kashmir in 2024?
n^2 - n + n - 1