Turn on thread page Beta
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    Community Assistant
    w=\lambda - 3i
    arg(4-5i+3w) = -\frac{\pi}{2}, Where \lambda is a real constant

    Find the value of \lambda

    How do I go about answering this question?
    Offline

    15
    ReputationRep:
    (Original post by NotNotBatman)
    w=\lambda - 3i
    arg(4-5i+3w) = -\frac{\pi}{2}, Where \lambda is a real constant

    Find the value of \lambda

    How do I go about answering this question?
    If the argument of the complex number is -π/2 then the complex number lies on the negative Im(z) (the Re(z)=0 line) axis and so the real part will be 0.what I'm saying is that inside the argument there should be no real terms, only imaginary terms which will be negative.
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    Community Assistant
    (Original post by B_9710)
    If the argument of the complex number is -π/2 then the complex number lies on the negative Re(z) axis and so the real part will be 0.what I'm saying is that inside the argument there should be no real terms, only imaginary terms which will be negative.
    Can't believe I missed that. Thank you.
    Offline

    20
    ReputationRep:
    (Original post by B_9710)
    If the argument of the complex number is -π/2 then the complex number lies on the negative Re(z) axis and so the real part will be 0.what I'm saying is that inside the argument there should be no real terms, only imaginary terms which will be negative.
    Im(z)
    Offline

    15
    ReputationRep:
    (Original post by the bear)
    Im(z)
    Thank you for spotting that. I was supposed to do Re(z) = 0 line.
    Offline

    20
    ReputationRep:
    (Original post by B_9710)
    Thank you for spotting that. I was supposed to do Re(z) = 0 line.
    :five:
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 22, 2016

3,035

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.