Solving a function with indices

[AndyIT]

I'm having trouble getting an iterative equation to solve. I can do it manually, so there is an answer, but for some reason MathCAD won't solve

1.552 = (V1 + 10)^1.4 / V1^1.4

It also works fine if I remove the indices

 

[IRstuff]

The actual worksheet would be infinitely more useful

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

 

[AndyIT]

All the relevant bits attached. I'm working in MathCAD 15, but saw most people being asked to upload in 13 so I've done that

 

[IRstuff]

Actually, the typical request is for M11 versions, before Mathsoft made their ill-fated conversion to M12.

The first question is why you're using the symbolic solve, given that you obviously need a numerical answer, and the algebraic solution of your question is relatively trivial.

You ought to be using either Given-Find or Given-Minerr, as shown in the attached sheet. Minerr generally will be more tolerant of ill-formed equations, while Find requires the solution to be within the default tolerances set within Mathcad. Minerr will usually find a solution that only minimizes the error.

http://files.engineering.com/getfil...-467f-90f8-979b3160b1d6&file=file_minerr.xmcd

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize