Let Z1 = (-1,-1) and Z2 = (1,1). Perform the operation Z1 and Z2. Use number pairs.
a Z1 + Z2 = (-4,0)
b Z1 + Z2 = (0,4)
c Z1 + Z2 = (0,0)
d Z1 + Z2 = (0,2)
I am assuming Z's are impedances, complex numbers represented by ...
Add the real parts together and add the imaginary parts together.