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

14.06.2025 00:19

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

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n^2 - n + n - 1

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Why cant school buses ditch kids who are late to the bus at the school? Like on the way home, if a kid is late when all the others arrived to the bus on time, why cant they leave the late kid behind since its not fair to the on time kids to wait?

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

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

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Why do I sweat so much after applying moisture or sun screen on my face? I have normal skin.

n^2 - 1

Move the nub up to the top:

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

What type of sex do women prefer, oral, anal, or vaginal?

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What sexual experience did you have at a highway rest area?

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

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

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When you visit a store, do you go to shop or buy?

(n - 1)(n + 1)