If and then which of the following is true?
a) z + w = 0
b) |z + w| = 0
c) a = -c
d) b = -d
I hate theory questions, I can't get them for some reason. Are there any properties that would help me with this question?
Here's how I interpret it, If arg(z+w) is 90 degrees, then z is perpendicular to w. I'm not sure what else to do for this kind of question. I know the answer, but I don't know why :( Can someone point me in the right direction?