The function values for the end points of the interval must be of opposite signs.

[Leakchhayvat]

Dear Expert MathCAD Prime Users,
While I am doing my assignment of Reinforcement Concrete Column Design I have a problem when I reached design axial compressive  I can not find the Value of a as you can see in my attached file in MathCAD Prime 7.0. The error message is "The function for the end points of the interval must be at opposite signs".  As I mentioned problem, I would like you to show me how to fix  this issue in order I can make a Column Interaction Diagram.
I am looking forward for your help and recommend.

Thank you!

[ttokoro · Accepted solution]

May be you should check the unit and sign of Stress in Reinforcement Bar at first.

May be this one.

[Leakchhayvat]

I have tried it. Anyway, would you mind please kindly send me the that you edited to me? I will have a look. Because I know that I still miss something in this, but I can not find it.

[ttokoro]

Just change the * to , at min function.

[Leakchhayvat]

Thank you sir! My bad.
I have solved it.