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

Last Updated: 19.06.2025 03:09

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

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

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What was your best unexpected reunion with your childhood best friend?

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

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Have you ever answered your door in lingerie?

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n^2 - 1

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What were the first few days, weeks, months and then years like after finding out about your spouses infidelity? How did your feelings, and yours & their approach to the situation change in the immediate aftermath compared to later down the line?

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

Move the nub up to the top:

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

Will my 9 year old face more difficulties than most girls her age if she’s an early bloomer? My daughter already needs regular B cup bras. The doctor says that my daughter will be even more developed by 11-12 years of age.

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(n - 1)(n + 1)

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

What would be the lowest score with 9 strikes and no gutter balls?

n^2 - n + n - 1