These can be entered via the Complete the Equation widget:
Here are some examples:
There are two response fields which the students have to fill in. This is also called a Template type of question. The evaluation in this case will check the validity of the question.
For example in preview mode if the student enters 4 and 12, it will not be true.
But other equivalent forms will be valid, for example:
Now, let's look at a more complex example using Matrices:
The student needs to enter two matrices, but there are an infinite number of valid solutions. We can check the evaluation in preview mode:
and here is an invalid solution: