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The quadratic formula can be used to solve quadratic equations, $ax^2+bx+c=0.$ $x=\dfrac{\text{-} {\color{#009600}{b}} \pm\sqrt{{\color{#009600}{b}}^2-4{\color{#0000FF}{a}}{\color{#FF0000}{c}}}}{2{\color{#0000FF}{a}}}$ Here, $a$ is the coefficient of the $x^2$-term, $b$ is the coefficient of the $x$-term, and $c$ is the constant.