How can I solve this problem?

[belleamie]

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

 

[marlon]

you should have posted this in the homework section.

What do you know on complex algebra ?

marlon

 

[Gokul43201]

(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.

 

[belleamie]

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...

 

[Gokul43201]

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

 

[belleamie]

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]

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

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

 

[Gokul43201]

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.