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

13.06.2025 01:48

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

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

(n - 1)(n + 1)

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Can you name a female actress who has had bad timing or luck in her film career?

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

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 started the whole idea of femboys? What is the whole point of a femboy? Did a boy or a man just randomly start dressing or acting feminine or something?

n^2 - n + n - 1

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Beautiful European women were killed by inquisition but Russia was not Catholic. Is this the reason for a drastic difference explaining why Russian women are the prettiest?

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

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

n^2 - 1

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Move the nub up to the top: