Re: finding inverses of functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg126430] Re: finding inverses of functions*From*: DrMajorBob <btreat1 at austin.rr.com>*Date*: Thu, 10 May 2012 04:57:04 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201205090750.DAA05576@smc.vnet.net>*Reply-to*: drmajorbob at yahoo.com

In the first place, you probably meant: Solve[y == 3 x^3 + 2 E^(2 x), x] (E is the euler constant whereas e is an unknown symbol.) But, sadly... Mathematica cannot solve that equation in general, and neither can anyone else. If YOU do, I think you'll quickly be famous. Bobby On Wed, 09 May 2012 02:50:21 -0500, John Accardi <accardi at accardi.com> wrote: > Hello, I am trying to get Mathematica to find the inverse of: > > y = 3x^3 + 2e^(2x) (which I know is invertible) > > InverseFunction only seems to give inverses of built-ins, like Sine. > > I tried: > > Solve[ y == 3x^3 + 2e^(2x), x ] but get a message that Solve does not > have methods suitable. (Solve works for simpler functions, however.) > > Any ideas? Thanks. > -- DrMajorBob at yahoo.com

**References**:**finding inverses of functions***From:*John Accardi <accardi@accardi.com>