Re: Simplfying inside Sqrt

*To*: mathgroup at smc.vnet.net*Subject*: [mg55122] Re: Simplfying inside Sqrt*From*: Peter Pein <petsie at arcor.de>*Date*: Sun, 13 Mar 2005 04:57:40 -0500 (EST)*References*: <d0u7bj$kph$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

billkavanagh at gmail.com wrote: > Hi > > I'm wondering how to tell mathematica that I want terms like > Sqrt[x^2+x^4] to be x*Sqrt[1+x^2]. I have an expression with a few > terms like this in it so manually inserting a > PowerExpand[Sqrt[Expand[x^2+x^4]] is no good to me. > > I've tried a general PowerExpand and Simplify with a Im[x]==0 around > the whole expression but with no luck. > > Does anybody know how to do this? > > Thanks, > Bill > > -- > William R. Kavanagh > http://www.physics.mun.ca/~wkavanag > There /has/ to be something more simple than Simplify[#1, x >= 0] & /@ (Sqrt[x^2 + x^4] /. (a_)^(b_) :> (#1^b & ) /@ Factor[a]) but I don't see it at the moment. -- Peter Pein Berlin

**Follow-Ups**:**Re: Re: Simplfying inside Sqrt***From:*DrBob <drbob@bigfoot.com>