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Math Help - plus and minus logs

  1. #1
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    plus and minus logs

    i can do the first one but the second one i cant seem to work it out
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  2. #2
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    Quote Originally Posted by realistic View Post
    i can do the first one but the second one i cant seem to work it out
    What base are you working to? That is an important omission on your part. Note that, for a > 0, 1 = \log_{a} a ....
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    Quote Originally Posted by mr fantastic View Post
    What base are you working to? That is an important omission on your part. Note that, for a > 0, 1 = \log_{a} a ....
    thats how the question in the book is

    log3−log10+1

    wouldnt the answer just be log3?
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    Quote Originally Posted by realistic View Post
    thats how the question in the book is
    Well, if the base is 10 then you know that \log 10 = 1 and so the answer to the second question is plainly \log 3 since the 1's will cancel.
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    Quote Originally Posted by mr fantastic View Post
    Well, if the base is 10 then you know that \log 10 = 1 and so the answer to the second question is plainly \log 3 since the 1's will cancel.
    ah yeah i see that but was not sure thanks for explaining it out
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