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Very Cool Story!

Hey,
I really like your website. For the first time ever, I see the importance of the quadratic formula. However, I need some help with a step, using the triangular field to develop c = ax^2 + bx. Why is the height 2x for the two right triangles. It's probably easy, but it's a step that is mysterious to me and my long work day, tired brain.

Thanks!

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