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May 18th, 2011, 02:54 PM   #1
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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
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May 18th, 2011, 03:26 PM   #2
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Re: question about square root

Charles,

Just to clarify, since sometimes contributors don't type-set 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...

-Ormkrr-
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