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

Last Updated: 19.06.2025 00:40

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

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(n - 1)(n + 1)

n^2 - n + n - 1

Why do some women alter their faces by so-called cosmetic surgeries (on their eyes, cheeks, lips, chin, jaw) that making them look like Donald Duck or puffy aliens, while for most men these unnatural facial changes are ridiculous or even disgusting?

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

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Am I the bitch for never wanting to talk to my sister again because of something she said while talking back to me?

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Move the nub up to the top:

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

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n^2 - 1

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How can a hacker damage me, realistically?

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

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

How do people develop stage 4 cancer without noticing until it’s too late?

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