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

09.06.2025 03:13

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

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n^2 - 1

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

Why do I have an itch in my labia, white gooey and thick discharge which doesn't have a smell but my vagina does sometimes and both me and my partner do not have STDs, what is it?

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

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What are some signs that someone may be being stalked by an organization or secret society? How can they find out for sure?

Move the nub up to the top:

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What’s one positive trait you’ve gained because of BPD?

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

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I see ugly guys dating gorgeous, "hot" women all the time. I, too, am not very attractive but I'm not doing well with the ladies. What's their secret?

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

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

Ask Ethan: What are the "first stars" in the Universe? - Big Think

(n - 1)(n + 1)