Question

dado z=1-2i ache o inverso de z

Answer 1

z^-1=1/(1-2i)=

     1        (1+2i)
---------x-------------=
(1-2i)      (1+2i)

(1+2i)/(1-4i^2)=
(1+2i)/(1+4)=
(1+2i)/5