Re: Exponential Equations

*To*: mathgroup at smc.vnet.net*Subject*: [mg28799] Re: [mg28792] Exponential Equations*From*: BobHanlon at aol.com*Date*: Sun, 13 May 2001 03:28:47 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Depending on which version you have, one or both of these will work Select[Solve[3^(2 x)==(1/9)^(x + 5),x], Element[x /. #, Reals]&]//FullSimplify Select[Solve[3^(2 x)==(1/9)^(x + 5),x], FreeQ[x /. #, Complex]&]//FullSimplify Bob Hanlon In a message dated 2001/5/12 9:48:40 PM, PLarson at bju.edu writes: >Why can't Mathematica find x = -5/2 when executing the following? Is >there a package I should load? It seems so simple. > >Solve[3^(2 x)==(1/9)^(x + 5),x] >