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

12.06.2025 00:18

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

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

Move the nub up to the top:

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

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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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Why do people have trouble accepting the very true fact that "The Blue Marble" photo of Earth is a composite and therefore (just like every other subsequent "picture" of Earth NASA has ever shown us) not a real photo but computer generated?

n^2 - n + n - 1

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

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

Why do atheists not love a G-d that does not stop punishing them harder and harder in this world and the next until they surrender to Him?

n^2 - 1

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(n - 1)(n + 1)