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

10.06.2025 05:00

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

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

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Move the nub up to the top:

(n - 1)(n + 1)

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If there is an abandoned house with no owner, can I live in it?

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2

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

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

Why is the concept of pumping water uphill not commonly used as a source of electricity generation, similar to pumped-hydro systems?

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n^2 - n + n - 1

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

Why do American conservatives say that America is a constitutional republic and not a democracy? Would it not make sense to call America a constitutional republican democracy?

n^2 - 1