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Math Help - Few questions about LOGS

  1. #1
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    Few questions about LOGS

    Hey forum, I'm a bit confused on a few questions, if the work is too hard to display just the answer would be alright I could work backwards to see what i did wrong!

    Thanks in advance!


    1) comparing Log(base9) X -> 3Log(Base9)[3(x+6)]-6 explain what has happened to the graph.

    2) Solve 10^(2x-5)=7^(x+4)

    3) Solve Log(3x+15)=Log(x+3)+1

    4) solve 9^(x-1)=1/3^(4x-1) <-- I got 1/3 for that one not sure if it's correct

    5) Solve 3^x = 9^(x^2-1/2)

    6) Solve 2Log(Base4)(x+4)-Log(base4)(x+12)=1 <---- I know that one involved doing quadratic forumula or factoring but not sure on how to do.

    7) explain steps to solving Log(base2)(Rootsymbol)x^2-8x=log(base2)3



    -ben
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  2. #2
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    Re: Few questions about LOGS

    It's hard to know what kind of help you need without knowing what you do understand about logarithms.

    Clearly you do know some of the things I started to write because, for problem 4, you say "I got 1/3 for that one not sure if it's correct", which is correct. But you don't show how you got it. Show what you have tried on these problems.
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  3. #3
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    Re: Few questions about LOGS

    Awesome thanks for the reply, I do understand about 2/3 of logs and i've solved the answers given, I just need to double check that my stuff is correct so I don't end using wrong steps on my upcoming test.

    Like for 1) I know the graph moves down 6 on the Y and when inside the brackets it's the opposite but im not sure if the graph moves -6 on X or it compresses or expands?
    Last edited by ben123123; May 2nd 2014 at 08:19 AM.
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  4. #4
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    Re: Few questions about LOGS

    I have a quiz later on today so i need to check my answers
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  5. #5
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    Re: Few questions about LOGS

    Yet, you still refuse to show your own work?
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