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

11.06.2025 01:05

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

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

(n - 1)(n + 1)

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

Can a dental anesthesia injection cause nerve damage? After receiving an injection in my gums I felt a sharp tingle going from the gum to my lower lip, and now sometimes I get a bit of itchiness and discomfort in my lower lip. What is it?

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Ethane Exporter Says U.S. Won’t Allow Shipments to China - WSJ

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

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Why do some young mothers trick a guy into believing that they're pregnant and it's their child when years later they find out that it's not even theirs should he still pay child support or not?

Move the nub up to the top:

n^2 - n + n - 1

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What was the weakest period in US history in terms of military strength? Was it during World War II or the Vietnam War?

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

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

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Is it possible for a judge to hold someone in contempt for not being able to pay a fine that was imposed during their sentencing hearing?

n^2 - 1