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

13.06.2025 02:45

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

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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Move the nub up to the top:

Is there such a thing as "left wing fascism"? If not, what is an example of a political ideology that is often mistakenly labeled as "left wing fascism"?

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

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Should I have left it alone and kept quiet? I came out as gay to my adult kids last week. Age 61 married 15 years, divorced for 20. I feel so guilty for ruining their lives by living a lie.

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

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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Do interviewers discriminate against a candidate if he or she is overweight (assuming physical fitness is NOT part of the job requirements)?

(n - 1)(n + 1)

n^2 - n + n - 1

n^2 - 1

What were Sauron's powers in The Lord of the Rings (LOTR)? Did he have any magic or anything like that?

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

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