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

Last Updated: 20.06.2025 00:17

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

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

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n^2 - 1

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It is common sense that Joe Biden is ruining America and is unfit to be president, but why are the liberals still supporting him when Trump is obviously a much better fit for office?

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

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

How do you know how physically attractive you actually are?

(n - 1)(n + 1)

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n^2 - n + n - 1

What exactly is the boundary men should follow while looking at girls so they don't call them perverts?

Move the nub up to the top:

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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Do you think your landlord should have a key to your room?

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