Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hi,

    I thought the attached vector question was fairly easy but I get a different answer to the back of the book. I'm nearly there, but my z coordinate is wrong. It would be right if I got '-1+4mu' but I keep getting '-1-4mu' for the z coordinate.

    Thanks,

    Carl
    Attached Images
     
    Offline

    11
    ReputationRep:
    (Original post by Orbit75)
    Hi,

    I thought the attached vector question was fairly easy but I get a different answer to the back of the book. I'm nearly there, but my z coordinate is wrong. It would be right if I got '-1+4mu' but I keep getting '-1-4mu' for the z coordinate.

    Thanks,

    Carl
    From a brief glance, I can't see anything wrong with your working. Maybe the book is wrong. It happens often enough.
    • Study Helper
    Offline

    7
    ReputationRep:
    (Original post by Orbit75)
    Hi,

    I thought the attached vector question was fairly easy but I get a different answer to the back of the book. I'm nearly there, but my z coordinate is wrong. It would be right if I got '-1+4mu' but I keep getting '-1-4mu' for the z coordinate.

    Thanks,

    Carl
    Your working is perfectly correct, The book answer is wrong or there is a misprint in the question
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks both for your help. I thought that a wrong answer was a possibility, but you can never tell. Irritating when you spend a couple of hours thinking you've done something wrong.
    Offline

    16
    ReputationRep:
    (Original post by Orbit75)
    Thanks both for your help. I thought that a wrong answer was a possibility, but you can never tell. Irritating when you spend a couple of hours thinking you've done something wrong.
    They have used +4k in the last part of the second line

    Either you mis-read or they did
    Offline

    12
    ReputationRep:
    (Original post by Orbit75)
    Hi,

    I thought the attached vector question was fairly easy but I get a different answer to the back of the book. I'm nearly there, but my z coordinate is wrong. It would be right if I got '-1+4mu' but I keep getting '-1-4mu' for the z coordinate.

    Thanks,

    Carl
    It should be +4k in l2.
    a should be 3.
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks both for your help.

    Yes, I agree it must be +4k and not -4k. It must just be a typo in the C4 edexcel revision book.

    Carl
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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