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-   -   Logarithmic equation (https://www.askmehelpdesk.com/showthread.php?t=150187)

  • Nov 9, 2007, 09:37 AM
    helpless06
    Logarithmic equation
    Solve the Equation:

    (log[base2]({2^2x}+1)-x)(3log[base8]({2^-2x}+1)+x-2)=15

    I know that I want to multiple the left hand side to get the form
    log[base something](equation)=15
    so that [base something]^15=equation but I do not know how to multiple the equation with the different bases.

    Help...
  • Nov 9, 2007, 11:28 AM
    asterisk_man
    (log[base2]({2^2x}+1)-x)(3log[base8]({2^-2x}+1)+x-2)=15
    just to restate the problem:

    I am pretty sure that this won't be trivial to solve.
    Your question: what is ? This doesn't really reduce into something else.

    I'll look at this problem a bit more but I suspect that it isn't really solvable algebraically.
  • Nov 9, 2007, 11:50 AM
    asterisk_man
    maybe try to look at the property:

    so:


    it seems to me that we might be able to go somewhere with that. The 3 that pops out looks awfully suspicious :)
  • Nov 9, 2007, 12:06 PM
    asterisk_man
    is this the whole problem or is this part of a larger problem? It doesn't seem like the equation you've given is solvable.
  • Nov 9, 2007, 12:23 PM
    helpless06
    This is the whole problem.
  • Nov 10, 2007, 06:28 AM
    galactus
    I would use tech to solve this monster.

    I ran it through my TI and got x=2.56920814769...

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