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Quadratic function

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A quadratic function is a function of the form <math>f(x)=ax^2+bx+c</math>, where a is nonzero. In the case where the domain and codomain are R (the real numbers), the graph of such a function is a parabola.

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Quadratic formula

... square roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from both sides, w ...