The roots of a quadratic function are where the lies interescts with the x-axis. There can be as little as zero.
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If the discriminant of the quadratic equation is zero then it will have 2 equal roots. If the discriminant of the quadratic equation is greater than zero then it will have 2 different roots. If the discriminant of the quadratic equation is less than zero then it will have no roots.
Either "roots" or "solutions".
To find the roots (solutions) of a quadratic equation.
That is what roots mean!
radical equations have sq roots, cube roots etc. Quadratic equations have x2.