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Math Help - Problem Wth Logarithm

  1. #1
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    Problem Wth Logarithm

    I've a problem getting the answer for this question using scientific calculator....

    2(lg4)^2


    The answer I obtained is different from the textbook answer.

    Hope someone can help me on this. Thanks.
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  2. #2
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    Do you want the decimal or a simplified form of the logarithm?
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  3. #3
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    In decimal. Thanks.
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  4. #4
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    Well, your problem is probably due to the confusion between log base e and base 10. Base e is symbolized as "ln" on your calculator, while base 10 is symbolised as "log"

    for the question, do you mean

     2(log4)^2 or (2 log 4)^2?

    And in what base are those logs?
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  5. #5
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    The first one....

    2(lg4)^2


    That is exactly the question shown.
    Last edited by RICTAN; April 1st 2008 at 10:41 PM. Reason: wrongly displayed
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  6. #6
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    For log base 10,

    2[(log4)^2] = 0.724952...

    For log base e

    2[(ln4)^2] = 3.843624...
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  7. #7
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    I've scanned the questions from the textbook. Questions a) and b), I have no problem. But questions c), d) and f) are problems.

    Thanks GUSBOB. But the answers are still incorrect. Wondering the text book has wrong answers.
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