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David Lee Ingersoll

David Lee Ingersoll is a cartoonist and illustrator[?] based in Seattle. He is married to writer Sarah Byam[?].

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Quadratic formula

... that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) ...