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The calculation of the roots of a quadratic equation in the set of real and complex numbers. Solving quadratic equation, roots - online calculator. Quadratic equation online. Is it Quadratic? Quadratic Equation. Only if it can be put in the form ax2 + bx + c = 0, and a is not zero. The name comes from "quad" meaning square, as the variable is squared (in other words x2). These are all quadratic equations in disguise: In disguise, In standard form, a, b and c. x2 = 3x -1, x2 - 3x + 1 = 0, a=1, b= quadratic equation calculator, quadratic calculator, algebra, algebraic equation calculator.