Question regarding complex numbers

  • #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.
 

Answers and Replies

  • #2
PeroK
Science Advisor
Homework Helper
Insights Author
Gold Member
2020 Award
16,190
8,222
You need to show your work.
 
  • #3
34,687
6,393
You need to show your work.
Yes, please show what you have done, Mohsin Hussain.

This is an important piece of information --
the equation az2 + az +1 =0 has a pure imaginary root
 
  • #4
sorry for bothering, it was a fairly easy one. didnt read the word "purely". Thanks.
 

Related Threads on Question regarding complex numbers

Replies
1
Views
7K
Replies
3
Views
2K
  • Last Post
Replies
10
Views
8K
  • Last Post
Replies
2
Views
918
  • Last Post
Replies
1
Views
518
  • Last Post
Replies
1
Views
874
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
5
Views
581
Replies
1
Views
446
Top