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What is a quadratic equation?\nA quadratic equation (also called a second-degree equation) is an equation that includes an x squared term. We write it like this: a x^2 + b x + c = 0, where a is not zero. When you draw the graph of a quadratic equation, it makes a U-shaped curve called a parabola.\n\nStandard form — How we usually write quadratics\nStandard form means the equation is written as a x^2 + b x + c = 0. The letters a, b, and c are numbers. Remember: a cannot be 0, otherwise the x^2 te