How can i find complex roots?

Hi all

i want to find complex roots of equation like"

       19                   936641               6
  10 + ---- a + -------------------------------- a
       1512     13778412440244368879163801600000

                         28771                 7
         - ---------------------------------- a
           4039043189625920705720588697600000

                            36139                   8
         + --------------------------------------- a
           162552639514225054108626998997811200000

                                                      9
         - 1/668788002572811651189779653019566080000 a

                                                            10     137     2
         + 1/376444958931811230179335208256551465779200000 a   + -------- a
                                                                 60540480

                67       3          3851          4
         + ------------ a  + ------------------- a
           670442572800      2393705253600460800

                     44623            5
         + ------------------------- a
           3876333646245309849600000

but, when i use functions of matlab this error appear: Undefined function or method 'isfinite' for input arguments of type 'sym'.

is there any one to solve this problem?

thanks for your attention.

Answer 1

[Michael scheinfeild]

roots([1 -2 3])

ans =

   1.0000 + 1.4142i
   1.0000 - 1.4142i

[ssss]

i used this function, but for this example it is not work.