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

10.06.2025 00:48

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

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n^2 - n + n - 1

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(n - 1)(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

Why does my 5-year-old daughter keep repeating the words 'they will come for us, they will find us and touch us'? I'm quite scared.

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

n^2 - 1

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Why do Indian parents force their kids to do stuff?

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

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

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

Why won't my mom let me come home if I'm homeless?

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With so much evidence supporting the flat Earth theory, why aren't more resources dedicated to studying it?

Move the nub up to the top: