Completing the Square

The geometric interpretation of completing the square. I wish they taught it this way when I was in gradeschool.

Addendum, it seems this image has gotten a lot of exposure after I uploaded it on wikipedia! Awesome!

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  1. looks like you forgot the second possible root. The boxed equation at the very end should have have a ± before the radical.

  2. which software did you use to draw those images ?

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