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

Last Updated: 16.06.2025 11:11

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

(n - 1)(n + 1)

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

Is Florida now unsurvivable because it's an oven due to climate change? It's 11:48 am on May 30th and the heat index in SoFla is 100. I can see it going up to over 130 by July.

Move the nub up to the top:

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How can Democrats not feel hypocritical when they urge Trump not to be vengeful should be become president when the Democrats are trying to put Trump into prison?

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n^2 - n + n - 1

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If sea levels were rising, wouldn't the acreage of coastal salt marshes increase? Are they?

n^2 - 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

Libtards argue Obama deported more people than Trump, but if that were true why weren't they comparing Obama to Idi Amin?

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

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

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Why do flat Earthers exist? Why can’t I see the Sun at night? Is it because Earth is not flat?

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