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

Last Updated: 18.06.2025 07:13

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

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

n^2 - n + n - 1

(n - 1)(n + 1)

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You found a love potion, and your friend tried to use it on an attractive popular girl, but he accidentally dropped it on the neighbors dog. Now the dog won't stop following him. How would you help him?

n^2 - 1

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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

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

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While wearing high heels and walking heel to toe, when the toe box hit the floor there is a noise. How do I keep the noise just for the heel?

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Move the nub up to the top:

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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