Results 1 to 4 of 4

Math Help - If A^X = B/C, where A, B and C are all known, how on earth do you work out X?

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    Edinburgh
    Posts
    2

    If A^X = B/C, where A, B and C are all known, how on earth do you work out X?

    Right, I should know the answer and I'm ashamed to have to ask for help but this is doing my head in.

    Actually trying to use this formula for a spreadsheet but I'm totally flumoxed!

    So, if A^X = B/C, how do I work out what X is?

    E.g, I know that 1.5^14 = 4379/15, but what if I didn't know that X was 14, how can I work it out?

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,069
    Thanks
    65

    Re: If A^X = B/C, where A, B and C are all known, how on earth do you work out X?

    Tattoo this on your wrist:

    if a^p = x then p = LOG(x) / LOG(a)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2012
    From
    Edinburgh
    Posts
    2

    Re: If A^X = B/C, where A, B and C are all known, how on earth do you work out X?

    Many many many thank yous!!!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Apr 2005
    Posts
    14,973
    Thanks
    1121

    Re: If A^X = B/C, where A, B and C are all known, how on earth do you work out X?

    So you've already got that tattoo?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Earth and sun
    Posted in the Algebra Forum
    Replies: 1
    Last Post: December 3rd 2010, 03:10 AM
  2. What on earth is a Subresultant?
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: June 25th 2010, 06:12 AM
  3. Radius of Earth
    Posted in the Pre-Calculus Forum
    Replies: 17
    Last Post: March 1st 2010, 04:16 PM
  4. Earth Question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 10th 2008, 12:27 PM
  5. what on earth is the formula?
    Posted in the Statistics Forum
    Replies: 7
    Last Post: July 8th 2006, 06:00 PM

Search Tags


/mathhelpforum @mathhelpforum