We are working with imaginary numbers right now. The question is attached. The answer is also attached. I just don't understand how to get the answer. Please help.

We are working with imaginary numbers right now The question is attached The answer is also attached I just dont understand how to get the answer Please help class=
We are working with imaginary numbers right now The question is attached The answer is also attached I just dont understand how to get the answer Please help class=