Question

ayuda
-(6+4i) - (3-9i)

Answer 1

-(6+4i)-(3-9i)
-6-4i-3+9i (suprimo parentesis, cambian los signos de los integrantes
(-6-3 ) ( -4i+9i)
-9+5i

Answer 2

$E=-[(6+4i)+(3-9i)]\\ \\ E=-[(6+3)+(4i-9i)]\\ \\ \boxed{E=-9+5i}$