Turn on thread page Beta

A few quick maths questions! PS. Its a bit of a competition! watch

    Offline

    13
    ReputationRep:
    1........ -b/2a
    Offline

    0
    ReputationRep:
    (Original post by RichE)
    Can we do these in reverse order? :rolleyes:
    hehe - patience is a virtue RichE :rolleyes: - showy oxford people
    Offline

    15
    ReputationRep:
    (Original post by DaveManUK)
    1. using quadratic eqn.
    1 as roots add to 2 and are conjugate complex numbers
    Offline

    0
    ReputationRep:
    (Original post by Rustyk1)
    so, first correct answer, apart from me is darth_vader05!

    Points:
    Spenceman_ = 1
    darth_vader05 = 1

    Question 3:

    Find the real part of either solution of

    x² - 2x + 5 = 0

    Getting tricker now?
    1+-2i - in my head-> real part is 1
    Offline

    15
    ReputationRep:
    (Original post by Phil23)
    hehe - patience is a virtue RichE :rolleyes: - showy oxford people
    Am I tired or did Phil just call me showy? :eek:

    As George Bush might have said if he could pronounce tetrasyllabic words - read my emoticons :p:
    Offline

    10
    ReputationRep:
    (Original post by RichE)
    1 as roots add to 2 and are conjugate complex numbers
    obviously. from fta.
    Offline

    0
    ReputationRep:
    (Original post by RichE)
    Am I tired or did Phil just call me showy? :eek:

    As George Bush might have said if he could pronounce tetrasyllabic words - read my emoticons :p:
    originally used "arrogant" but thought you'd get offended, so wuickly editted it

    pk
    Offline

    13
    ReputationRep:
    (Original post by Phil23)
    originally used "arrogant" but thought you'd get offended, so wuickly editted it

    pk
    Actually, you used "arrognat" :rolleyes:
    • Thread Starter
    Offline

    1
    ReputationRep:
    Slow reactions this time! Be patient they will get trickier.

    Points:
    Spenceman_ = 1
    darth_vader05 = 1
    DaveManUK = 1

    Question 4

    Find the modulus of the complex number (7-4i)
    Offline

    13
    ReputationRep:
    √(7²+4²) = √(65)
    Offline

    10
    ReputationRep:
    \font{3}|7-4i|=\sqrt{7^2+(-4)^2}=\sqrt{65}
    Offline

    13
    ReputationRep:
    www.le-sqarye-roote-de-la-sixtey-fayve.com
    • Thread Starter
    Offline

    1
    ReputationRep:
    SsEe, correct, and fast too!

    Points:
    Spenceman_ = 1
    darth_vader05 = 1
    DaveManUK = 1
    SsEe = 1

    Question 5

    find the argument of the complex number

    (-1 +2i)

    Answers (0<x<360)
    Offline

    13
    ReputationRep:
    90+arctan(2) degrees
    Offline

    10
    ReputationRep:
    90^\circ+\tan^{-1}{2}=153.43^\circ (2d.p.)
    • Thread Starter
    Offline

    1
    ReputationRep:
    Quote: Answers (0<x<360)
    Offline

    1
    ReputationRep:
    153.4349488229220106484278062795 5 degrees to 29 d.p
    • Thread Starter
    Offline

    1
    ReputationRep:
    lol
    • Thread Starter
    Offline

    1
    ReputationRep:
    still havent heard the right answer
    Offline

    10
    ReputationRep:
    (Original post by Rustyk1)
    Quote: Answers (0<x<360)
    thats wrong arg is measured ±0:180.
 
 
 
Turn on thread page Beta
Updated: June 21, 2005
The home of Results and Clearing

1,054

people online now

1,567,000

students helped last year

University open days

  1. London Metropolitan University
    Undergraduate Open Day Undergraduate
    Sat, 18 Aug '18
  2. Edge Hill University
    All Faculties Undergraduate
    Sat, 18 Aug '18
  3. Bournemouth University
    Clearing Open Day Undergraduate
    Sat, 18 Aug '18
Poll
A-level students - how do you feel about your results?
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.