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Solve command | equation single variable

Check attached files.

My attempt is to solve for x at a certain p value. Can anyone explain why the solve command and solve block fails?

 

  1. According to Brent Maxfield's monograph “Essential PTC Mathcad Prime 3.0 (2014)” ch.10 pg. 312, the 3.0 version has a bug with modifiers which could implement constraints. Has this been fixed in 3.1? I want to eliminate complex roots and filter real roots.. Will assume command be any use in 3.1 as it make no difference in 3.0 version?
  2. Does the solver fail because of the expression in the equation “’x’ to the power ‘i’” where x has multiple roots and “i” is also running from 1-14, 1-17? However, in reality “i” is affiliated in sigma and when expanded it cannot be considered as a range.. Can this be sorted if I re-arrange it in vector form? Like using a vector and a poly-root command?
  3. Check attached file “Patek & Klomfar..”. If you look at the last 2 equations which I’ve disabled if not it will take nearly 5 hours to solve each. (Should be done one at a time) The value of x should be between 0 to 1. The results were a bit goofy like it gives me “MuPAD not responding” and the values change each time I get a proper answer. Is there an alternative method to solve this? What I have in mind is to expand all sigmas.. if that helps.
  4. Check attached file “test”. “i” runs from 1 to 5 thus making a polynomial max of 25 and also of a non-integer 1.25 (5/4). Mathcad took a while to get the solution but I’m only interested in  real roots. Is there a way to filter the real root and save time?
  5. Check attached screenshot. Is it normal to have a large thick title bar when solving?

 

Manilka Jayasooriya

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