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R
rskibba1-Visitor
1-Visitor
October 20, 2016
Question

How to take the positive root for system of equations?

  • October 20, 2016
  • 6 replies
  • 2730 views

I need to solve the equations for X,Y and Z.  My current issue is I need a single equiation for each to solve the system.  What is happening is I end up with a  +/- solution due to the radical in the denominator.  So how do I get MathCAD to use just the positive value and solve for all three variables?

6 replies

V
ValeryOchkov24-Ruby IV
24-Ruby IV
October 20, 2016

I hope You will understand why You have no solution

R
rskibba1-VisitorAuthor
1-Visitor
October 20, 2016

Valery,

Thanks for the response. OK I get it. I think the question I am really trying to answer is given the partial derivative of S on my attached script, How can I symbolically solve for X,Y, and Z?

Thanks,

Richard

L
LucMeekes23-Emerald IV
23-Emerald IV
October 20, 2016

With something like this:

Success!
Luc

L
LucMeekes23-Emerald IV
23-Emerald IV
October 20, 2016

You can't.

I'll demonstrate it on a simpler example. Given:

Please indicate the positive results for x, y and z.

Success!
Luc

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