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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
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