Logs HELP!!

Maths and statistics discussion, revision, exam and homework help.

Announcements Posted on
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
Search Thread
Advanced Search
Sign in to Reply
  1. zoey21's Avatar
    1 21-04-2012  17:20
    • Junior Member
    • Posts: 27
    Logs HELP!!
    Hi, im stuck on a logarithms question, - 3^(x-1) = 8^ (x+1)

    my working so far => x-1/x-2 = log10(3)/log10(8)

    ==> ( i dont know how to divide x-1 from x-2) or do you even do that? = 0.53

    Thanx
  2. steve10's Avatar
    2 21-04-2012  17:38
    • Exalted and Worshipped Member
    • Location: .
    • Posts: 1,063
    Re: Logs HELP!!
    you should have

    (x-1)/(x+1) = ln(8)/ln(3)
  3. steve2005's Avatar
    3 21-04-2012  18:12
    • TSR Demigod
    • Location: LONDON
    Re: Logs HELP!!
    (Original post by steve10)
    you should have

    (x-1)/(x+1) = ln(8)/ln(3)
    I think this is better.




    Uploaded with ImageShack.us
    Last edited by steve2005; 21-04-2012 at 18:14.
    Post rating:
    1
  4. zoey21's Avatar
    4 22-04-2012  14:57
    • Junior Member
    • Posts: 27
    Re: Logs HELP!!
    thanx i got it
  5. PoorLoser's Avatar
    5 22-04-2012  15:27
    • Exalted Member
    • Posts: 396
    Re: Logs HELP!!
    Mind telling me what the answer is? I've been trying to work it out lol
  6. steve2005's Avatar
    6 22-04-2012  15:53
    • TSR Demigod
    • Location: LONDON
    Re: Logs HELP!!
    (Original post by PoorLoser)
    Mind telling me what the answer is? I've been trying to work it out lol
    This should help.
    Attached Thumbnails
    Click image for larger version.  Name: Screen shot 2012-04-22 at 15.51.19.png  Views: 20  Size: 9.7 KB  ID: 143406  
  7. zoey21's Avatar
    7 22-04-2012  21:59
    • Junior Member
    • Posts: 27
    Re: Logs HELP!!
    (Original post by PoorLoser)
    Mind telling me what the answer is? I've been trying to work it out lol
    sure its -3.24
  8. steve2005's Avatar
    8 22-04-2012  22:05
    • TSR Demigod
    • Location: LONDON
    Re: Logs HELP!!
    (Original post by zoey21)
    sure its -3.24

    Yes, but if you are still not sure use your calculator to check.




    Uploaded with ImageShack.us
Sign in to Reply
Search Thread
Advanced Search
Share this discussion:  
Useful resources

Articles:

Study Help rules and posting guidelinesStudy Help Member of the Month nominationsGuide to MathematicsMathematics resourcesMathematics websitesMathematics revision notes in the TSR wikiCambridge Assessment admissions tests (including STEP)How to use LaTeXCareers in Mathematics

Useful Dates:

Quick Link:

Unanswered Maths Threads

Groups associated with this forum:

View associated groups
Article updates
Moderators

We have a brilliant team of more than 60 volunteers looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is moderated by:

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

Shortcuts

Get Started

TSR Group

Using TSR

Info

Connect with TSR

Reputation gems:
The Reputation gems seen here indicate how well reputed the user is, red gem indicate negative reputation and green indicates a good rep.
Post rating score:
These scores show if a post has been positively or negatively rated by our members.