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

Last Updated: 21.06.2025 03:45

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

Move the nub up to the top:

(n - 1)(n + 1)

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So I’m getting piano lessons and my teacher wants me to get an upright piano instead of a keyboard. An upright piano is way above my price range, so what do I do? And what’s the difference between an upright piano and a keyboard?

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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What techniques can be used to sing like Freddie Mercury if one is unable to hit high notes?

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

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

n^2 - 1

Where's the Civil War everyone on the left said would happen?

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

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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PC modding repository Nexus Mods has a new owner - The Verge

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What is the most popular song that includes the word "you"? Are there any other songs that use "you" multiple times?

n^2 - n + n - 1