Nikolaos Dergiades, Geogebra construction of the roots of quadratic, cubic and quartic equations,
Forum Geometricorum, 16 (2016) 29--35.

Abstract. We construct geometrically the roots of a quadratic equation, which construction is ruler and compass possible, where the roots are signed segments and the roots of a cubic or quartic equation, that are not ruler and compass constructible, for which we give conic (with intersections of parabolas) dynamic constructions, easily performed via computer applications such as Geogebra etc and apply this construction to the trisection of an acute angle.

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