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#1

$Old$ August 9th, 2009, 05:49 PM

Såxon $Såxon is offline$

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$Default$ 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

$Old$ August 9th, 2009, 05:56 PM

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Originally Posted by Såxon $View Post$

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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$Old$ August 9th, 2009, 06:08 PM

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maybe you mean 2^-x -6=0??

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$Old$ August 9th, 2009, 06:10 PM

Såxon $Såxon is offline$

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oh wow, sorry yes it is (2^-x) - 6 = 0...

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$Old$ August 9th, 2009, 06:15 PM

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Originally Posted by Såxon $View Post$

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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