Re: Exponential Equations
- To: mathgroup at smc.vnet.net
- Subject: [mg28801] Re: Exponential Equations
- From: "Paul Lutus" <nospam at nosite.com>
- Date: Mon, 14 May 2001 01:32:54 -0400 (EDT)
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
"Phil Larson" <PLarson at bju.edu> wrote in message
news:9dlcea$o31 at smc.vnet.net...
> 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]
What do you mean? Solve solves it as written. Solve is not meant to find
a particular numerical root of an equation, it is designed to find all
symbolic solutions if it can. For this equation, it can and does.
If you want just a single numerical root, use FindRoot.
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