Question

Z1 = 4+5i , Z2=-3+2i e Z3=9i , Calcule

a) Z1+Z2-Z3

Answer 1

$Z_1=4+5i \\ \\ Z_2=-3+2i \\ \\ Z_3=9i \\ \\ Z_1+Z_2-Z_3= \\ \\ 4+5i-3+2i-9i= \\ \\ 4-3+5i+2i-9i= \\ \\ 1-2i$