Solving exponential equation using a... graph?

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August 9th 2009, 04:49 PM
Såxon

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
August 9th 2009, 04:56 PM
skeeter

Quote:

Originally Posted by Såxon

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

$2^{-x} = 6$

???
August 9th 2009, 05:08 PM
Wesker

maybe you mean 2^-x -6=0??
August 9th 2009, 05:10 PM
Såxon

oh wow, sorry yes it is (2^-x) - 6 = 0...
August 9th 2009, 05:15 PM
skeeter

Quote:

Originally Posted by Såxon

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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