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Homework Help: Log base 2 key strokes.

  1. Sep 14, 2007 #1
    1. The problem statement, all variables and given/known data
    2^x=1500. solve for x. I need to know the key strokes on my scientific calculator. If I push log, it assumes log base 10. I need base 2.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 14, 2007 #2
    do you know of a formula that can be used to "change bases" for logs?
     
  4. Sep 14, 2007 #3
    I don't recall it. Can you give it to me? Is there no way to find the log base 2 on a calculator?
     
  5. Sep 14, 2007 #4
    If i remember right it's
    [tex]log_b a = \frac{log_k a}{log_k b}[/tex]
    Where k is the base you're going to. In this case it would be base 10 so just log in your calculator.
     
  6. Sep 14, 2007 #5
    What do you put in place of a and b?
     
  7. Sep 14, 2007 #6
    I got that to work. I figured it out. Thanks a lot. It just seemed like there was a way to figure that out on a calculator but I can't remember for sure.


    Starchild
     
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