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

12.06.2025 13:20

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

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

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n^2 - n + n - 1

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(n - 1)(n + 1)

What is the recommended approach for creating a film or TV script? Should the script be written first or should the story be developed first? Why?

Move the nub up to the top:

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n^2 - 1

I am 13 and I am planning to run away. What should I do to succeed?

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

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

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I can’t get any girl I want, but I can just get some not my type of girls, so I feel I’m so ugly. What should I do?

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