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

    2
    ReputationRep:
    Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?

    Name:  ImageUploadedByStudent Room1473600689.642359.jpg
Views: 113
Size:  27.3 KB


    Posted from TSR Mobile
    • Very Important Poster
    Offline

    21
    ReputationRep:
    Very Important Poster
    (Original post by Eden00)
    Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?

    Name:  ImageUploadedByStudent Room1473600689.642359.jpg
Views: 113
Size:  27.3 KB


    Posted from TSR Mobile
    Please show your working
    • Community Assistant
    • Welcome Squad
    Online

    20
    ReputationRep:
    Community Assistant
    Welcome Squad
    (Original post by Eden00)
    Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?


    Posted from TSR Mobile
    What's wrong with it? The power decreases by 1 and \frac{3}{2}-1=\frac{1}{2} if that's what you're struggling with?
    Offline

    4
    ReputationRep:
    If its the fractional power that is making it hard for you, lets stick a 1 in front of the x. Now you can differentiate it how you did the other ones; 1 * 3/2 then subtract 1 from the power.
    • Thread Starter
    Offline

    2
    ReputationRep:
    It's not the differentiation part it's the finding the points.



    The answer is (16,-31) and I'm unsure how to get there

    EDIT: I know in the photo it's -5, but I meant it to be 5, I rewrote my workings to post quickly and made the mistake


    Posted from TSR Mobile
    Attached Images
     
    Offline

    11
    ReputationRep:
    (Original post by Eden00)
    It's not the differentiation part it's the finding the points.



    The answer is (16,-31) and I'm unsure how to get there


    Posted from TSR Mobile
    When you differentiate a constant it disappears remember
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by solC)
    When you differentiate a constant it disappears remember
    I'm an idiot... I'll have a go now and see what I get


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by solC)
    When you differentiate a constant it disappears remember
    I got rid of the constant the first time I attempted it, the second time I didn't but I'm still running into the same problem.

    Name:  ImageUploadedByStudent Room1473602479.786730.jpg
Views: 113
Size:  132.4 KB

    I get to this, but this isn't the right answer? What step am I missing


    Posted from TSR Mobile
    Offline

    11
    ReputationRep:
    (Original post by Eden00)
    I got rid of the constant the first time I attempted it, the second time I didn't but I'm still running into the same problem.

    Name:  ImageUploadedByStudent Room1473602479.786730.jpg
Views: 113
Size:  132.4 KB

    I get to this, but this isn't the right answer? What step am I missing


    Posted from TSR Mobile
    I think you are getting confused with what x^1/2 means. If you have 4=x^1/2 you need to square both sides instead of taking the square root,
    Offline

    11
    ReputationRep:
    (Original post by OGFakiie)
    lol this is amateur stuff
    Sorry big man
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by solC)
    I think you are getting confused with what x^1/2 means. If you have 4=x^1/2 you need to square both sides instead of taking the square root,
    Ahh thank you! I feel like such an idiot!! I was confusing myself so much, such a stupid mistake. Thank you for the help!


    Posted from TSR Mobile
    Offline

    7
    ReputationRep:
    (Original post by solC)
    Sorry big man
    sfe
    Offline

    11
    ReputationRep:
    (Original post by Eden00)
    Ahh thank you! I feel like such an idiot!! I was confusing myself so much, such a stupid mistake. Thank you for the help!


    Posted from TSR Mobile
    No worries
    • Community Assistant
    • Welcome Squad
    Online

    20
    ReputationRep:
    Community Assistant
    Welcome Squad
    (Original post by OGFakiie)
    sfe
    What does Student Finance England got to do with this?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by OGFakiie)
    lol this is amateur stuff
    Im glad I'm an amateur then


    Posted from TSR Mobile
    Offline

    7
    ReputationRep:
    (Original post by RDKGames)
    What does Student Finance England got to do with this?
    good one i'll give you that
 
 
 
  • 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
    Would you like to hibernate through the winter months?
    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.