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Recall the general form: ax² +bx +c = 0

You should be familiar with the Quadratic Formula. The Discriminant is used to predict the nature of the roots of an equation, it is the radicand in the formula.

\boxed{discriminant = b^{2} -4ac}

Two distinct real roots if discriminant >0.

Equal roots if discriminant = 0.

Two distinct unreal(imaginary) roots if discriminant <0.