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

12.06.2025 09:18

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

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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

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Are you more of a butt guy or a boob guy?

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

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Move the nub up to the top:

Riddle: How do budget cuts, DEI hires, and empty reservoirs, turn the bluest, most Democrat city Red?

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

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n^2 - 1

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

How can Democrats not feel hypocritical when they urge Trump not to be vengeful should be become president when the Democrats are trying to put Trump into prison?

(n - 1)(n + 1)