Yet another maths question. Im stuck :(

Why oh why do i go to Student Union bar in between lectures....



Complex numbers...

What is the polar form of z=4j ?

I did z=3+2j and z=1-5j but in this case... What do you do with the real part? Its missing. Should it be z=1+4j or something else?

Thanks a lot!

 

Wait... j represents an imaginary number? like i?

And what course is that in?

 

That's right. Its the maths bit of my tech science degree.

 

that is an interesting one.

 

ever so slightly, yes

 

hm...

*grabs his book and frowns upon the spam from daffybug above this post*
Well, my book told me nothing, and my knowledge of complex numbers on a scale of one to ten, is like a 6-7...

Maybe this will help:
http://en.wikipedia.org/wiki/Polar_form#Polar_form

edit: Just a second thought, have you tried anything with absolute value?
Too bad DP didn't have Latex.

 

I already had a look at that. Hmmmm... In theory, if you plot it on the Argand diagram its 90 degrees but i need to be able to calculate it the hard way. As far as i remember you just need to add something to z=4j

Thanks for trying to help me

 

If i remember correctly after 12 years its like this

 

this is my answer, 4 with 90 degrees. so, what's the prob with that ?

 

Yep, that does seem to be the right answer. Thanks a lot guys!

 

The answer is "who cares"

I did that on a test once. Math professors (especially in college) are completely devoid of a sense of humor too - but I found this out too late

 

Back in my weed smoking days i used to draw whacky pictures on maths exams. That did not work either.