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Vitalik1-Visitor
1-Visitor
June 21, 2011
Solved

Problem with solving square equation!

  • June 21, 2011
  • 2 replies
  • 4836 views

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!

Best answer by VladimirN

Hello!

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

Equation.JPG

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

Symbolic_assume.GIF

2 replies

V
VladimirN24-Ruby IIIAnswer
24-Ruby III
June 21, 2011

Hello!

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

Equation.JPG

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

Symbolic_assume.GIF

V
Vitalik1-VisitorAuthor
1-Visitor
June 21, 2011

Thank you very much, you helped me a lot

V
VladimirN24-Ruby III
24-Ruby III
June 22, 2011

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

M
MikeArmstrong1-Visitor
1-Visitor
June 21, 2011

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

Mike

V
Vitalik1-VisitorAuthor
1-Visitor
June 21, 2011

Thank you, i appreciate your help

M
MikeArmstrong1-Visitor
1-Visitor
June 21, 2011

No problem at all.

Mike

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