This evaluation type checks if the variable in the "Definition" field is present in the operator of the "Definition" field, i.e. times,x checks whether the variable x is solved in a multiplication.
Example:
The second argument in the "Definition" can be a list, where multiple variables can be searched with an OR. For example, the following rule checks whether there is a division involving either x or y.
An optional third argument in the "Definition" specifies the position of the variable(s). For example, the following rule checks whether the denominator (and not the numerator) of a fraction has an x or y in it.
Similarly, the rule in the next example checks whether there is an x in the left argument of a multiplication:
Note
if your feedback rule does not seem to work for some reason, try deleting any spaces in the feedback Definition.
Automated feedback
Below are some examples of what the automated feedback of this evaluation type looks like:
More on evaluation types
An overview of all evaluation types can be found here (for mathematical answers) and here (for text-based answers). More detail on the different fields of a feedback rule can be found here.