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Re: Resolve a function
*To*: mathgroup at smc.vnet.net
*Subject*: [mg89706] Re: [mg89697] Resolve a function
*From*: Bob Hanlon <hanlonr at cox.net>
*Date*: Wed, 18 Jun 2008 06:40:40 -0400 (EDT)
*Reply-to*: hanlonr at cox.net
f[r_] = 144/10*((2/Sqrt[r^2 + R^2]) - 1/r);
soln = Solve[f[r] == 0, r]
{{r -> -(R/Sqrt[3])}, {r -> R/Sqrt[3]}}
Simplify[f[r] /. soln, R > 0]
{(144*Sqrt[3])/(5*R), 0}
Simplify[f[r] /. soln, R < 0]
{0, -((144*Sqrt[3])/(5*R))}
---- maria <m.massaouti at windowslive.com> wrote:
> Dear all,
> I am new with mathematica. I would be grateful if someone could tell
> me how can I find the general solutions of the r for the following
> function f(r_) = 14.4* ((2/Sqrt[r^2 + R^2]) - 1/r ) (where
> R=constant). I just want to express the function as r =.....*f. Is
> this possible with mathematica.
> Thank you.
>
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