Solve the quartic equation [math]x^4-3x^2+4x-3=0[/math].

From the graph, you can see that 1.3 and -2.3 are the real roots of the quartic polynomial. By the complex root tool on GeoGebra, 0.5 +0.87[i]i[/i] and 0.5-0.87[i]i.[/i]