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

12.06.2025 10:32

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

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

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n^2 - n + n - 1

What does it mean if you dream your dad died?

(n - 1)(n + 1)

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Nintendo Switch 2’s faster chip can dramatically improve original Switch games - Ars Technica

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

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Is there a stereotype that South Indians are physically strong and muscular compared to other regions of India?

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

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

39-year-old quit nursing to become a mechanic—her business brings in $440,000 a year: ‘It was the fastest way to make money' - MSN

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n^2 - 1

What's wrong with white women?

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