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

10.06.2025 06:02

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

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Move the nub up to the top:

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

Is it okay or problematic to be both Black and gay in society in the 21st century?

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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How did Madri, mother of Nakula and Sahadeva die?

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

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

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n^2 - n + n - 1

How do I identify fake friends in life?

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 - 1)(n + 1)

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n^2 - 1