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

    2
    ReputationRep:
    I had this question in the june 2014 C3 paper, and as you can see from the answers, the only answer if the positive root (X=5), and doesn't acknowledge any second answer of X, as you would get from the negative root/factoring (would be X=-1)

    So do you only take the positive root from now on? (In as it always seemed to be both)

    Thanks
    Name:  image.jpeg
Views: 74
Size:  94.2 KBAttachment 508683508685
    Attached Images
     
    Offline

    8
    ReputationRep:
    (Original post by JohnnyDavidson)
    I had this question in the june 2014 C3 paper, and as you can see from the answers, the only answer if the positive root (X=5), and doesn't acknowledge any second answer of X, as you would get from the negative root/factoring (would be X=-1)

    So do you only take the positive root from now on? (In as it always seemed to be both)

    Thanks
    Name:  image.jpeg
Views: 74
Size:  94.2 KBAttachment 508683508685
    yes it looks like you'd use the positive root in this case as i assume the X=-1 solution wouldn't comply with the respective domain (and range) of the initial function (where x>2)
    Offline

    18
    ReputationRep:
    (Original post by JohnnyDavidson)
    I had this question in the june 2014 C3 paper, and as you can see from the answers, the only answer if the positive root (X=5), and doesn't acknowledge any second answer of X, as you would get from the negative root/factoring (would be X=-1)

    So do you only take the positive root from now on? (In as it always seemed to be both)

    Thanks
    Name:  image.jpeg
Views: 74
Size:  94.2 KBAttachment 508683508685
    IT is given in the question that x > 2


    Posted from TSR Mobile
    Offline

    19
    ReputationRep:
    (Original post by JohnnyDavidson)
    I had this question in the june 2014 C3 paper, and as you can see from the answers, the only answer if the positive root (X=5), and doesn't acknowledge any second answer of X, as you would get from the negative root/factoring (would be X=-1)

    So do you only take the positive root from now on? (In as it always seemed to be both)

    Thanks
    Name:  image.jpeg
Views: 74
Size:  94.2 KBAttachment 508683508685

    http://www.thestudentroom.co.uk/forumdisplay.php?f=38
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by xs4)
    yes it looks like you'd use the positive root in this case as i assume the X=-1 solution wouldn't comply with the respective domain (and range) of the initial function (where x>2)
    Ah ok thanks, didnt think to check back to the initial function.

    So in general still take positive and negative, unless mentioned otherwise?
    Offline

    8
    ReputationRep:
    (Original post by JohnnyDavidson)
    Ah ok thanks, didnt think to check back to the initial function.

    So in general still take positive and negative, unless mentioned otherwise?
    Yeah
    Offline

    13
    (Original post by JohnnyDavidson)
    Ah ok thanks, didnt think to check back to the initial function.

    So in general still take positive and negative, unless mentioned otherwise?
    In general just give the answer to what the domain says

    Pretty sure you could loose marks if you don't? Unless the markscheme says "ignore X=..."
 
 
 
  • 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
    What's your favourite Christmas sweets?
    Help with your A-levels

    All the essentials

    The adventure begins mug

    Student life: what to expect

    What it's really like going to uni

    Rosette

    Essay expert

    Learn to write like a pro with our ultimate essay guide.

    Uni match

    Uni match

    Our tool will help you find the perfect course for you

    Study planner

    Create a study plan

    Get your head around what you need to do and when with the study planner tool.

    Study planner

    Resources by subject

    Everything from mind maps to class notes.

    Hands typing

    Degrees without fees

    Discover more about degree-level apprenticeships.

    A student doing homework

    Study tips from A* students

    Students who got top grades in their A-levels share their secrets

    Study help links and info

    Can you help? Study help unanswered threadsRules and posting guidelines

    Sponsored content:

    HEAR

    HEAR

    Find out how a Higher Education Achievement Report can help you prove your achievements.

    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.