Logo

Why is (n-1)(n+1)=n^2-1?

12.06.2025 01:51

Why is (n-1)(n+1)=n^2-1?

xxx

So, that’s a rectangle with sides 2 and 4.

xxxx

Do you think all these charges that have been brought against Trump are just a coincidence? If he was such a big threat why did they wait 3 years to bring these charges? Or is this all just election interference?

xx

Move the nub up to the top:

The basic answer is that you cross-multiply the values in each factor:

Have you ever accidentally found out that you were about to be fired?

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

n^2 - n + n - 1

Why do people who were very kind and loving once become cold-hearted?

(n - 1)(n + 1)

xxx x

n^2 - 1

Why did my ex-narcissist move so fast with his new supply marriage engagement moving in, etc.?

If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2

xxxx

And you are left with almost a square. One less than the square of side n.

Astronomers thought the Milky Way was doomed to crash into Andromeda. Now they’re not so sure - The Conversation

xxx