# Not sure how to solve this problem

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

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

What do you know on complex algebra ?

marlon

Gokul43201
Staff Emeritus
Gold Member
(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 refered 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...

Gokul43201
Staff Emeritus
Gold Member
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

Curious3141
Homework Helper
belleamie said:
I'm not sure how to write it in that form

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

Gokul43201
Staff Emeritus