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

13.06.2025 02:41

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

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

What do you love to do at night when you’re alone?

Move the nub up to the top:

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

n^2 - n + n - 1

Why do I feel so tired all the time even after a good night’s sleep?

n^2 - 1

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Have you ever been forced into bestiality?

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

How do I identify fake friends in life?

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(n - 1)(n + 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

I took a video of my serve (60 FPS) and it took 0.4 seconds from my racket to the service line. How fast would you say my serve was?

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