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Math Help - Need Help Math homework >.<

  1. #1
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    Need Help Math homework >.<

    Hi there the question is Solve log6(x-1)+log6(x+4)=2 I dont get any solutions i cant factor it.

    and the second one is log2(2x+4)+log2(x-1)=3 I get 2.5 as answer.

    lastly loga(x - 3)(x + 4) + logax = loga5

    Thanks ahead of time.
    Last edited by Gurp925; May 5th 2013 at 12:08 AM.
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  2. #2
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    Re: Need Help Math homework >.<

    Sorry there is one more logsqrt2(x-2)+logsqrt2(x+1)=4
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  3. #3
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    Re: Need Help Math homework >.<

    I can not understand fully your question, because you do not use proper mathematical symbols. But, I will try to answer it.

    a) \log_{6}{(x-1)} + \log_{6}{(x+4)} = \log_{6}{36} \Leftrightarrow \\ \Leftrightarrow \log_{6}{[(x-1)(x+4)]} = \log_{6}{36} \Leftrightarrow \\ \Leftrightarrow (x-1)(x+4) = 36 \quad etc... \quad The \quad others \quad are \quad exactly \quad the \quad same
    Thanks from topsquark
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  4. #4
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    Re: Need Help Math homework >.<

    That equation does not factor so what to do?
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  5. #5
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    Re: Need Help Math homework >.<

    Distribute (FOIL) the left side, then subtract through by 36, and you will have a quadratic that factors nicely...and be mindful of the domain of the log functions...
    Thanks from topsquark
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