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

08.06.2025 02:22

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

n^2 - 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

n^2 - n + n - 1

How did China invent gunpowder but it was the European nations that went out and “conquered the world using firearms”?

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Why do Trump supporters believe Trump should deport the immigrants? These people you call "illegal immigrants" have lived here for many years, they have houses, jobs, how can you think they will just go back to their country, where they have nothing?

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

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Why is America so fucked up?

(n - 1)(n + 1)

Move the nub up to the top:

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

What is the best technique for inserting a tampon into one’s anus?

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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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Why have feminists not demanded that females be required to register with the selective service? Are female lives more precious than male lives?

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