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

    20
    ReputationRep:
    I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
    Attached Images
     
    Offline

    3
    ReputationRep:
    (Original post by Sint)
    I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
    Your method is correct! Just look over your working and check the numerator. It seems you made a slight slip in expanding the brackets (the simplifying bit).

    PS. It is already in the form a+b(root)5! Remember that 'a' and 'b' can be a fraction
    Offline

    21
    ReputationRep:
    why do you write your surds like that? Looks like you're trying to use things like the cubed root of 5 instead of 3 root 5.
    • Community Assistant
    • Study Helper
    Offline

    20
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by Sint)
    I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
    As a side note, try to write the numbers in front of your square roots like this:

    5\sqrt{5}

    Instead of this

    \sqrt[5]{5}

    The second one looks more like the 5th root of 5.
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    Community Assistant
    Welcome Squad
    (Original post by surina16)
    why do you write your surds like that? Looks like you're trying to use things like the cubed root of 5 instead of 3 root 5.
    Oh god...

    I think I just had a heart attack.
    Offline

    21
    ReputationRep:
    also, -7 + 3 = -4
    Offline

    21
    ReputationRep:
    (Original post by RDKGames)
    Oh god...

    I think I just had a heart attack.
    what... did I say something stupid?
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    Community Assistant
    Welcome Squad
    (Original post by surina16)
    what... did I say something stupid?
    No, I'm agreeing with you.

    At least the cat is nice.
    Offline

    21
    ReputationRep:
    (Original post by RDKGames)
    No, I'm agreeing with you.

    At least the cat is nice.
    Ah, you had me questioning all my maths skills there for a minute :lol:

    I agree.
    • Thread Starter
    Offline

    20
    ReputationRep:
    Thanks for the help guys!


    Posted from TSR Mobile
 
 
 
  • 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
    Brexit voters: Do you stand by your vote?
    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

    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.