** Using WeBWorK **

You can also manually set the correct answer latex string for a MathObject.  For example:

$ans->{correct_ans_latex_string} = "2\sqrt{2}";

This will override what appears in the "Correct Answers" column of the results table, but there are a couple of things to watch out for:

1. Variables will be interpolated (so you could do $ans->{correct_ans_latex_string} = "2\sqrt{$a}";), but no further processing will be done on the string.
2. Since you are overriding the display it is possible to have the correct answer that is displayed to students differ from the actual correct answer (for example due to a typo, or modifying $ans after setting correct_ans_latex_string).