KnowraQuadratic equationLinked fromLinked fromThe 28 pages that link to Quadratic equation, each with the reason it gives.All 28Broader topic 10Related 12Narrower topic 3Compared with 3Completing the squareNarrower topic: Completing the square solves quadratics by isolating a squared expression.Quadratic formulaNarrower topic: The formula solves this broader class of equations when the leading coefficient is nonzero.Descartes' theoremNarrower topic: Solving the theorem for one curvature produces a quadratic with two possible tangent circles.