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May 18th, 2011, 02:54 PM  #1 
Newbie Joined: May 2011 Posts: 1 Thanks: 0  question about square root a, b, c, and d are all composed of linear combination of constants or variables that will be defined by differntial equation then, I have A= x + sqrt(x^2  4ac)/2a B= A + sqrt(A^2  4bd)/2b C= A+B I am trying to express x =............... by C I know I probably can spend a lot of time and expand it, but I am also wondering if there is any easier way to do that. Thank you, CHarles 
May 18th, 2011, 03:26 PM  #2 
Senior Member Joined: Jun 2010 Posts: 618 Thanks: 0  Re: question about square root
Charles, Just to clarify, since sometimes contributors don't typeset the expressions they mean with complete accuracy, which form do you have in mind or In either case, I don't see how you can avoid a rather messy expression for x, but maybe someone else will have some penetrating insight... Ormkärr 

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