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

Last Updated: 21.06.2025 00:47

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

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

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

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Is it common for Americans to feel "trapped" due to the size and distance of their country from other countries/continents? Is this feeling an exaggeration or a reality?

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Move the nub up to the top:

Why are there posts saying the T in LGBT should be dropped? With what is happening in the US and beyond against the trans community cause for concern that if this is accepted could it be deemed acceptable to start on the LGB community again?

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n^2 - 1

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Do humans know everything they need to know?

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

n^2 - n + n - 1

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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

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 - 1)(n + 1)

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