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

15.06.2025 07:26

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

n^2 - 1

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If there exists a “New York of Australia”, is it Sydney or Melbourne?

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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Why do flat Earthers exist? Why can’t I see the Sun at night? Is it because Earth is not flat?

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

Move the nub up to the top:

Can cheating be a result of not truly loving or caring for someone, or is it sometimes just a spur of the moment decision?

(n - 1)(n + 1)

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

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

Why can't I lose weight?

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n^2 - n + n - 1

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—— which songs do certain kuorans remind you of?

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