# Solve f(x) in terms of another variable? Or just in general.

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Logan el 11 de Abr. de 2013
I am trying to solve the equation
1=.2*b*e^(-.5x)+(1-.1e^(-.5x)).5e^(-.5(1-.1e^(-.5x))(x/b))
I tried to it for a specific b value but I got an error which is odd because WolfRamAlpha managed to do it. So I must be doing something wrong. I tried
solve('1=.2*100*e^(-.5x)+(1-.1e^(-.5x)).5e^(-.5(1-.1e^(-.5x))(x/100))')
Ideally I'd like to solve it for x in terms of b so that I can then evaluate the x value for a range of b's.
I was wondering if anyone had any tips on how to do this?
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### Respuestas (1)

Mahdi el 11 de Abr. de 2013
First of all, unless you define e as a number, MATLAB doesn't recognize it as the number e. To use the number e (2.71..), you should use exp().
Second of all, look at the examples for solve to see how it is used. You need to define x as a symbol. From there, it should be easy to figure out.
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Walter Roberson el 11 de Abr. de 2013
Also, you need to include multiplication explicitly, such as 0.5*x instead of 0.5x; likewise between the "5x)" and the "(x/b)"

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