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

10.06.2025 11:57

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

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n^2 - 1

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

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Do women lack the mental strength to succeed at STEM? There seems to be few women at STEM and more women leave STEM after a time of working at it. How can it be just sexism if women aren't banned from entering?

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

Move the nub up to the top:

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What if Supergirl was a baby and not a teenager when she left Krypton? Who do you think will find her? What do you think things would be like?

n^2 - n + n - 1

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

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(n - 1)(n + 1)

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

What are some ways to improve speed in sprinting, running uphill, and long/middle distance running?

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