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

13.06.2025 10:19

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

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(n - 1)(n + 1)

n^2 - n + n - 1

Do individuals with borderline personality disorder have awareness of their actions or do they believe their behavior is normal?

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

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

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I am 13 and I am planning to run away. What should I do to succeed?

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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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n^2 - 1

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How can someone get patrons on Patreon if they are a beginner artist?

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

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What’s the best way to get over someone you love?

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2