Quadratic formula

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In elementary algebra, the quadratic formula is a closed-form expression describing the solutions of a quadratic equation. Other ways of solving quadratic equations, such as completing the square, yield the same solutions. Given a general quadratic equation of the form ⁠ a x 2 + b x + c = 0 {\displaystyle \textstyle ax^{2}+bx+c=0} ⁠, with ⁠ x {\displaystyle x} ⁠ representing an unknown, and coefficients ⁠ a {\displaystyle a} ⁠, ⁠ b {\displaystyle b} ⁠, and ⁠ c {\displaystyle c} ⁠ representing known real or complex numbers with ⁠ a ≠ 0 {\displaystyle a\neq 0} ⁠,...

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