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

Last Updated: 20.06.2025 00:07

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

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n^2 - n + n - 1

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

Why do siblings (or other close relatives) stop visiting each other as they grow older? Why does this happen with so many people nowadays?

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

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What misfortune led to an important discovery?

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

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For those who were actually old enough to have experienced the 1970s and not for those who were born in the 70s. What were the pros and cons of that era?

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

Move the nub up to the top:

Is it okay if I am not interested to talk to any of my relatives as I saw the real faces in my brother's marriage as none of them helped us rather were a kind of disappointment and were talking bad?

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

n^2 - 1

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What is the experience of wearing a school uniform every day? Do people typically get used to it or dislike it?

(n - 1)(n + 1)