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06-21-2011
10:50 AM

06-21-2011
10:50 AM

Hi everyone!

I have square equation, and I have to find x, so I use solve function and find 2 values of x, for example, positive x and negative x. Then I have to use that x in further equations, but only positive value of x.

Maybe someone could tell me how can I make that mathcad will use only positive x value in further equations and ignore negative?

Please look a file in attachment!

Thank you!

Solved! Go to Solution.

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06-21-2011
11:00 AM

06-21-2011
11:00 AM

Hello!

Use the symbolic operator "assume" (in our case: "assume, x> 0"):

The operator "assume" can be found on a toolbar "Symbolic":

7 REPLIES 7

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06-21-2011
11:00 AM

06-21-2011
11:00 AM

Hello!

Use the symbolic operator "assume" (in our case: "assume, x> 0"):

The operator "assume" can be found on a toolbar "Symbolic":

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06-21-2011
11:19 AM

06-21-2011
11:19 AM

Re: Problem with solving square equation!

Thank you very much, you helped me a lot

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06-22-2011
02:55 AM

06-22-2011
02:55 AM

Re: Problem with solving square equation!

You're welcome. I also have attached to the message file Mathcad 15.

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06-21-2011
01:05 PM

06-21-2011
01:05 PM

Re: Problem with solving square equation!

Another way but not as elegant as Valdimir's solution.

Mike

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06-21-2011
01:24 PM

06-21-2011
01:24 PM

Re: Problem with solving square equation!

Thank you, i appreciate your help

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06-21-2011
03:46 PM

06-21-2011
03:46 PM

Re: Problem with solving square equation!

No problem at all.

Mike

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06-21-2011
03:52 PM

06-21-2011
03:52 PM

Re: Problem with solving square equation!

Another slightly different way, see x2.

Mike

Message was edited by: Mike Armstrong - Correct worksheet included