Question: real and imaginary roots

Hi, sorry to post this as I have read past topics about roots but havent really understoond much.

I have an equation that gives 8 roots. some of them can be real and some can be imaginary. how do i list them separately? I attach the worksheet...

 

View 11295_21feb.mw on MapleNet or Download 11295_21feb.mw
View file details

 

Thank you,

Please Wait...