We need to simplify :
[tex]\mleft(9+9.4i\mright)+\mleft(-8.6-4i\mright)[/tex]Combine the like terms
[tex]\begin{gathered} \mleft(9+9.4i\mright)+\mleft(-8.6-4i\mright) \\ =(9+(-8.6))+(9.4i+(-4i)) \\ =(9-8.6)+(9.4i-4i) \end{gathered}[/tex][tex]=0.4+5.4i[/tex]
