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

Last Updated: 28.06.2025 06:37

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

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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

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Is Europe willing to risk losing its alliance with the United States, if they choose to continue the war in Ukraine?

Move the nub up to the top:

(n - 1)(n + 1)

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Why are many women so drawn or attracted to men that have been or are currently in prison and men that are involved in street life/illegal activities?

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

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

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n^2 - 1

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

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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