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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



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