Re: solving an equation with sums

*To*: mathgroup at smc.vnet.net*Subject*: [mg67481] Re: solving an equation with sums*From*: "Valeri Astanoff" <astanoff at yahoo.fr>*Date*: Wed, 28 Jun 2006 03:51:19 -0400 (EDT)*References*: <e7qmi0$6lb$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Priviet! If you expand your expression you can see that all terms are of the form -a*E^(-b*x), so, the whole expression is allways negative and tends to zero only when x -> Infinity. Anyway, in such a case and if there was a solution, you better use FindRoot than Solve. hth V.Astanoff