We believe we have a working template for this now, in case anyone follows the thread.
The attached problem asks for solutions to x^2=28 (or something similar) and expects variants of "x=2sqrt(7) or x =-2sqrt(7)". Tailored feedback is given for unreduced decimals, and several other things.
The problem uses contextLimitedRadical.pl, the latest version of which can be found in this thread. Be sure to scroll down to grab the latest version - not an earlier draft.
WeBWorK Problems
Requiring reduced radical in list of assignments
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