Re: Equation problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg109292] Re: Equation problem*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Tue, 20 Apr 2010 05:53:40 -0400 (EDT)

On 4/19/10 at 4:07 AM, imoric1 at gmail.com (Asttro) wrote: >I just started using Mathematica and have no idea how to do the >following... >I have the starting equation: >y=((1+sqrt(5.71e8/x))*x)/6.38e9 >What I want is to obtain x=a+b*y, where a and b are parameters. >Is this possible in Mathematica? Yes. But first you will need to use the appropriate syntax. In Mathematica, an equation has a double equal sign (==) not a single equal sign. All built-in functions begin with an upper case letter and function arguments are delimited with square brackets. That is, your equation needs to be written as: y == ((1 + Sqrt[5.71 10^8/x]) x)/6.38 10^9 or y == ((1 + Sqrt[5.71*10^8/x])*x)/6.38*10^9 Then doing Solve[y == ((1 + Sqrt[5.71 10^8/x]) x)/6.38 10^9, x] will give you the desired solutions