Roots of a Quartic polynomial with complex coefficients computed using symbolic solutions

[size=85] Enter the values of the [u][b]complex[/b][/u] coefficients a, b, c and d of the [b]Quartic[/b] polynomial using the input fields and find its roots. The roots z1, z2, z3, z4(are indicated in red) are calculated directly in the GeoGebra window.[/size]
– Roman Chijner

Information: Roots of a Quartic polynomial with complex coefficients computed using symbolic solutions