1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Question regarding complex numbers

  1. Feb 8, 2015 #1
    1)If a= cosα + i sinα and the equation az2 + az +1 =0 has a pure imaginary root, then tanα=?

    2) cosα+isinα=e , quadratic formula

    3) What i tried to do was,i put a constant real number and tried to solve it and used demoivres theorem, although the answer is getting weirder and weirder.
     
  2. jcsd
  3. Feb 8, 2015 #2

    PeroK

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You need to show your work.
     
  4. Feb 8, 2015 #3

    Mark44

    Staff: Mentor

    Yes, please show what you have done, Mohsin Hussain.

    This is an important piece of information --
     
  5. Feb 13, 2015 #4
    sorry for bothering, it was a fairly easy one. didnt read the word "purely". Thanks.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Loading...