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

11.06.2025 15:19

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

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(n - 1)(n + 1)

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

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

When Chinese people see my pets, will they think of it as their food?

n^2 - 1

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

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Why has my ex moved on so fast after years of being together with me?

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n^2 - n + n - 1

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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

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Why isn't the FBI raiding all Silicon Valley companies like Facebook, Twitter, Instagram, WhatsApp, TikTok, Reddit, Google, Yahoo, YouTube, Disqus, Wikipedia for censoring the World through their Ban cartel violating the constitution freespeech laws?

Move the nub up to the top: