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

11.06.2025 06:53

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

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(n - 1)(n + 1)

n^2 - 1

Would you let your partner cheat on you every now and again?

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

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

Move the nub up to the top:

What is the best sex you have ever had (in detail)?

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

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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

n^2 - n + n - 1

I took a video of my serve (60 FPS) and it took 0.4 seconds from my racket to the service line. How fast would you say my serve was?

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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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