Re: Incompletely simplified Square root.
- To: mathgroup at smc.vnet.net
- Subject: [mg121064] Re: Incompletely simplified Square root.
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Fri, 26 Aug 2011 05:22:05 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
On 8/25/11 at 7:04 AM, paulvonhippel at yahoo.com (paulvonhippel at yahoo) wrote: >Can someone tell me why the following input doesn't produce an >output of 0.68....? Why is the output under the radical? Thanks! >In[574]:= Sqrt[\!\(\* TagBox[ FractionBox["926", "2025"], >PolynomialForm]\)] // N >Out[574]= Sqrt[\!\(\* TagBox["0.45728395061728394`", >PolynomialForm]\)] You are getting this result because of PolynomialForm. The Sqrt function doesn't know how to evaluate something with a head of PolynomialForm. That is when I copy paste your input into Mathematica and use FullForm on the output I get In[8]:= FullForm[%] Out[8]//FullForm= Power[PolynomialForm[0.45728395061728394`],Rational[1,2]] If I simply type the problem in In[9]:= Sqrt[926/2025] // N Out[9]= 0.676228 I get the expected result.