Re: Simplfying inside Sqrt

*To*: mathgroup at smc.vnet.net*Subject*: [mg55126] Re: Simplfying inside Sqrt*From*: "Carl K. Woll" <carlw at u.washington.edu>*Date*: Sun, 13 Mar 2005 04:57:44 -0500 (EST)*Organization*: University of Washington*References*: <d0u7bj$kph$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Bill, Have you tried applying rules? Something like: Sqrt[x^2+x^4]/.Sqrt[a_]:>PowerExpand[Sqrt[Factor[a]]] 2 x Sqrt[1 + x ] Carl Woll <billkavanagh at gmail.com> wrote in message news:d0u7bj$kph$1 at smc.vnet.net... > 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 >