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

    2
    ReputationRep:
    The question is
    Lnx/x^2 = 0

    I need to solve it but for some reason the answer is 1, but I dont get how its one, because if i take the x to the power of 2 to the other side, and E both sides you get

    X = e to the power of x^2
    Offline

    15
    ReputationRep:
     \ln(1)=0 , so we are looking for  x/x^2 to = 1.
    • Community Assistant
    Offline

    17
    ReputationRep:
    Community Assistant
    (Original post by SunDun111)
    The question is
    Lnx/x^2 = 0

    I need to solve it but for some reason the answer is 1, but I dont get how its one, because if i take the x to the power of 2 to the other side, and E both sides you get

    X = e to the power of x^2
    If you take the x^2 to the other side, do you not get 0*x^2=0?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by rayquaza17)
    If you take the x^2 to the other side, do you not get 0*x^2=0?
    Oh yeah, that works out thanks
    Offline

    19
    ReputationRep:
    (Original post by SunDun111)
    The question is
    Lnx/x^2 = 0

    I need to solve it but for some reason the answer is 1, but I dont get how its one, because if i take the x to the power of 2 to the other side, and E both sides you get

    X = e to the power of x^2
    if a/b = 0 then a = 0
    Offline

    3
    ReputationRep:
    I think some of the above didn't realise you meant:

    (ln x) / (x2) = 0
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by NadeemKha_Arab)
    I think some of the above didn't realise you meant:

    (ln x) / (x2) = 0
    Yeah i did but isnt what they said still true?
    Offline

    3
    ReputationRep:
    (Original post by SunDun111)
    Yeah i did but isnt what they said still true?
    (Original post by rayquaza17)
    If you take the x^2 to the other side, do you not get 0*x^2=0?
    This one is correct^ yes. Did you manage to see how the answer was reached after following this?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by NadeemKha_Arab)
    This one is correct^ yes. Did you manage to see how the answer was reached after following this?
    yeah taking E to both sides got me X = 1, is the rule a/b=0 means a=0 valid for everything
    Offline

    2
    ReputationRep:
    (Original post by SunDun111)
    yeah taking E to both sides got me X = 1, is the rule a/b=0 means a=0 valid for everything
    assuming b is non-zero, yes.
    Offline

    3
    ReputationRep:
    (Original post by SunDun111)
    yeah taking E to both sides got me X = 1, is the rule a/b=0 means a=0 valid for everything
    Yep what you'll see with a slightly more complex equations is you can use that rule to help:

    e.g. (x2+3) / (3-y3) = 0

    This means you can just get rid of the bottom and solve for x. I know this different to your question, but that's basically to show that it works.
 
 
 
  • 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
    Has a teacher ever helped you cheat?
    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.