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

Last Updated: 02.07.2025 00:55

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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Scientists Just Found the Oldest Barred Spiral Galaxy – And It’s a Monster - SciTechDaily

(n - 1)(n + 1)

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n^2 - n + n - 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

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

Why do people turn a blind eye to bad behaviour if someone is very good looking? Whereas if someone is ugly, they get harshly judged for everything?

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

How would you advertise if you wanted to be a "tour guide" who can take you through the dark web while warning you what not to look at and not to click on?

Move the nub up to the top:

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n^2 - 1

Appendix cancer cases on the rise in youngsters: 5 early signs that go unnoticed - Times of India

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