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

14.06.2025 04:35

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

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(n - 1)(n + 1)

Is anyone else losing complete respect for the US at this point?

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n^2 - n + n - 1

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

It seems that I am cursed with bad luck. How do I break such a curse?

Move the nub up to the top:

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Romania in the past was a poor country, but last year the government announced it had 521 billion leu (113$ billion dollars) revenue. Why is so much? What's the reason?

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

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

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

Are LGBT people accepted in Japan?

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

Why cant I stop thinking about counsellor between sessions?

n^2 - 1