# Graphic representations of complex numbers

Hello can someone help I've been doing some exercises about complex numbers. But I am not really good at reading their graphic representations. Can you guys tell me if I did the exercise right, please?

The exercise: Let us consider the complex numbers z and w drawn in the Argand plane. What is the complex number u represented?

1. I choose -2z
2. I choose the conjugate of z
3. I choose z + w
4. I choose 1/w
5. I choose zw
• Can you rewrite your question to be a bit more clear? Are you being presented choices? What is $z$, what is $w$? – scoopfaze Dec 2 '19 at 3:05
• @scoopfaze I am sorry I hit the button submit with out adding the pictures – aita.kane Dec 2 '19 at 3:08
• No worries, just trying to prevent downvotes – scoopfaze Dec 2 '19 at 3:10
• First three look alright. I’m skeptical of the last two – scoopfaze Dec 2 '19 at 3:15
• Thank you for your help. – aita.kane Dec 2 '19 at 3:30

They are all correct. Pro-tip, when you multiply two complex numbers, you're adding their "angles" (with respect to the positive x-axis), so it makes sense that $$zw$$ is "between" $$z$$ and $$w$$.