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Finding log something, in terms of A and B.

  1. Oct 19, 2009 #1

    Suy

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    1. The problem statement, all variables and given/known data

    If Logb2=A and Logb49=B, what is logb397, in terms of A and B.

    This is one of the bonus question in my geometric quiz and i don't remember if the number is 397. I wonder if anyone get this?
    2. Relevant equations



    3. The attempt at a solution
    here is what i did
    bA=2 and bB=49
    b=21/A b=491/B
    491/B=21/A --> log(49)/log(2)=B/A

    because this is geometric quiz, so i assume this one have a geometric
    so i use arn-1
    r : log(49)/log(2)=B/A
    a : log(2)

    log(2)(B/A)n-1=logb397
    am i right?
     
    Last edited: Oct 19, 2009
  2. jcsd
  3. Oct 19, 2009 #2

    Suy

    User Avatar

    sorry wrong post....
     
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