# Not sure how to solve this problem

• belleamie
In summary, the conversation is about a question regarding complex algebra and the suggestion is to review the basics of complex numbers before attempting to solve it. The question is also suggested to be posted in the homework section for better assistance.

#### belleamie

not sure how to solve this problem, Any suggestions or examples?

#### Attachments

• quantumque3.bmp
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you should have posted this in the homework section.

What do you know on complex algebra ?

marlon

(This is not Quantum Physics - moving to homework help)

The question is wrongly written. It is asking you to show that the modulus of the product of 2 complex numbers is equal to the product of their moduli, and that the argument is equal to the sum of their arguments.

marlon said:
you should have posted this in the homework section.

What do you know on complex algebra ?

marlon
Hmm the problem was a review question for my quantum 1 class which is why i posted it here. Since I wasnt sure exactly where in my book it referred to it. I'm taken up to linear algebra a couple yrs ago. I cut and pasted thequestion as it was typed in my notes...

What happens if you write the complex numbers in the polar (exponential) form ?

Gokul43201 said:
What happens if you write the complex numbers in the polar (exponential) form ?
I'm not sure how to write it in that form

belleamie said:
I'm not sure how to write it in that form

$$z = r(\cos \theta + i\sin \theta) = re^{i\theta}$$

belleamie said:
I'm not sure how to write it in that form
In that case, you need to go over your chapter on complex analysis from the start. If you do not know the basics of complex numbers, you will not get anywhere by cutting and pasting solutions.