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Math Help - Logarithm Urgent

  1. #1
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    Logarithm Urgent

    Solve, correct to 3 significant figures, the equation
    e^x + e^2x = e^3x
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  2. #2
    Senior Member Peritus's Avatar
    Joined
    Nov 2007
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    \begin{gathered}<br />
  e^x \left( {e^{2x}  - e^x  - 1} \right) = 0 \hfill \\<br />
  z \equiv e^x  \hfill \\<br />
   \Rightarrow z\left( {z^2  - z - 1} \right) = 0 \hfill \\ <br />
\end{gathered}

    now solve the quadratic equation and back substitute for x.
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