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In the quadratic formula, the expression underneath the square root sign is called the discriminant of the quadratic equation, and is often represented using an upper case "D "
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For equation 

ax² + bx +c = 0

x=\frac{-b+\sqrt{b^2-4ac}}{2a}   and    x=\frac{-b-\sqrt{b^2-4ac}}{2a}
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