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This problem was contributed by @wrobel so we have to ask him. I guess it only refers to the quadratic form of the equation. The clue is to use the symmetry.DEvens said:What doyoumean by quadrature? I can find several potential meanings that could be relevant. For example, it could mean doing an integral. It could mean a particular method of numerical solution. It could mean something about fitting things to a rectangle. It could mean something about a quadratic equation.