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

14.06.2025 08:02

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

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My boss called me on a Saturday to let me know he that due to financial reasons, I was no longer needed effective immediatley. 3 days later, he sends me a text asking about work issues. How do I respond?

n^2 - 1

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2

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What does it mean when a guy says he doesn't want to ruin the friendship? Is he rejecting me or is there another explanation? Why would a guy choose not to risk the friendship if he has feelings for me?

Move the nub up to the top:

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

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

n^2 - n + n - 1

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

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

(n - 1)(n + 1)

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