. "equation" . "Quadratic" . . "quadratic equation" . "Quadratic roots" . . "quadratic solutions" . . "Quadratic equation#Quadratic formula and its derivation" . . "quadratic formula" . . "Quadratic_equation" . . . "solution of single variable quadratic equation" . "quadratical" . . "discriminant" . . . . . . . . "quadratically" . "Quadratic equation" . . "Quadratic equation" . . . "Quadratic_equation#Quadratic_formula" . "second degree" . . . "quadratics" . "Quadratic equations" . . . "quadratic" . . "Quadratic_equation#Solving_the_quadratic_equation" . .