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Math Help - Solving exponential equation using a... graph?

  1. #1
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    Solving exponential equation using a... graph?

    What am I suppose to look for on the graph, in order to solve this?
    Sorry if this seems obvious.
    Use a graph to solve the equation 2^-x - 6
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  2. #2
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    Quote Originally Posted by Sxon View Post
    What am I suppose to look for on the graph, in order to solve this?
    Sorry if this seems obvious.
    Use a graph to solve the equation 2^-x - 6
    is the equation supposed to be

    2^{-x} = 6

    ???
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  3. #3
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    maybe you mean 2^-x -6=0??
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  4. #4
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    oh wow, sorry yes it is (2^-x) - 6 = 0...
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  5. #5
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    Quote Originally Posted by Sxon View Post
    oh wow, sorry yes it is (2^-x) - 6 = 0...
    you could use a graph on a calculator and calculate the root.

    or ...

    2^{-x} = 6

    \ln(2^{-x}) = \ln(6)

    -x \cdot \ln(2) = \ln(6)

    x = -\frac{\ln(6)}{\ln(2)}
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