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

13.06.2025 00:20

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.

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

How did my ex move on very fast?

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Move the nub up to the top:

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What is the difference between the terms "Millennials" and "kids"?

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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n^2 - 1

How do I stop my 12-year-old daughter from crying herself to sleep? I have punished her and she still does 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

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

Why do Puerto Ricans come to this country flying their flags over in the United States all over their cars? They're so proud of their country. Why are they here?

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(n - 1)(n + 1)

To a flat Earther, what's wrong with the idea that gravity is simply a force inherent to space which operates only in one dimension? Why do they go further and try to deny gravity rather than just saying it's different than physicists claim?

n^2 - n + n - 1