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

    0
    ReputationRep:
    small factorisation problem I'm stuck on:

    given graph y= x (exp n), where n is an integer. Given that the curve passes between the points (2, 200) and (2, 2000), determine the value of n.




    hints or tips much appreciated !
    Offline

    3
    ReputationRep:
    Do you mean y=x^n ?
    • Thread Starter
    Offline

    0
    ReputationRep:
    yes, sorry
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Naomiimoan)
    Do you mean y=x^n ?

    little help?
    Offline

    3
    ReputationRep:
    (Original post by minimalme)
    little help?
    Well don't take my word for it because I haven't really come across this kind of question before but I used trial and error..
    I n=9 by making x=2 (as it's in the coordinates) which gave me y=2^n
    The question says y is between 200 and 2000 so I just did 2x2x2... Until I got a number that was close to 2000-200 which I now realise is kinda silly...

    You could try something like (log base 2 of 2000) - (log base 2 of 200) which equals log base 2 of 10.

    Sorry I'm on the overground which no calculator..

    Edit: and it doesn't help that I haven't done this before..why is no one else helping you..
    • Thread Starter
    Offline

    0
    ReputationRep:
    the answer is 9. i found it out by trial and error. but the log b 2 is the right way to go. it is one of those questions where it so easy you actually over thinking. the weather is not helping either getting me all hot!

    thanks for ur efforts
 
 
 
  • 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 rather give up salt or pepper?
    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.