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

15.06.2025 10:12

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

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(n - 1)(n + 1)

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Why do our deceased do not protect us from other bad spirits?

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

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

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Was there any slavery of white people that actually compares to the transatlantic slave trade? I’m not baiting or anything actually genuinely curious and want to know.

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 gun lovers think their right to own a weapon supercedes everyone else's right to be safe and not be shot?

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

n^2 - n + n - 1

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

Why does my mother care about my sister more than me?

n^2 - 1

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Move the nub up to the top:

Can you give an example of a documentary where the person telling the story believed it to be true, but it turned out to be false?

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