## Answer :

[tex]8\sqrt{-65}=8\sqrt{65\cdot(-1)}=8\sqrt{65}\cdot\sqrt{-1}=8\sqrt{65}\ i[/tex]

[tex]8\sqrt{-65}=8\sqrt{65\cdot(-1)}=8\sqrt{65}\cdot\sqrt{-1}=8\sqrt{65}\ i[/tex]