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Math Help - differential equation (substitution)

  1. #1
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    differential equation (substitution)

    for this question , i 've got my positive 9 but i got -64 , can anyone tell me which part is wrong?

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  2. #2
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    Re: differential equation (substitution)

    When you take e to the \ln \left| -\frac{64}{9} \right|, you get \frac{64}{9}, not -\frac{64}{9}.

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