Problem with square brackets in fSolve

[rawi]

Hi Didier,

thank you very much for your fast and helpful answer. In CAS mode it works fine. I tried in home mode and there I got again the message "Error: Syntax Error".

In CAS mode the +/- before the closing of the square bracket that is generated as soon a square bracket is opened disappear when pressing Enter. In home mode it does not disappear.
And I think it strange that this is a problem to be solved in CAS mode as it is a strictly numeric problem.

But I am glad that I now know how to do it. Thank you once more!