How can I find the roots of this complex equation?

[vinodjoshi]

Dear all
I have an equation which is as follows

[D^4+(2*D^3)-(D^2)-(2*D)+(i/(l^4))]y=0

where D=d/dz, l is a constant and i is a complex no.

I want to find out the roots of this equation. How can I find the roots. If there is any online calculator which is capable to do so please let me know.

Thanks in advance

 

[CompuChip]

http://www.wolframalpha.com/input/?i=Solve+[D^4+(2*D^3)-(D^2)-(2*D)+(i/(l^4))]==0+for+D

Something like that?

 

[vinodjoshi]

Dear CompuChip
Thanks very much