The calculator solves for the roots of a quartic equation. Enter values into the fields to form equation of the type
and press 'calculate'. The roots are given in the form
ax4 + bx3 + cx2 + dx + e = 0
where i is the square root of -1. If n is not zero then the root is complex. If n is zero then the root is real.
m + ni
Press "see graphical function" to display the graph for the function you input (requires Java).