User functions Wiris Quizzes Studio uses symbolic notation so we can work with variables and symbols. This is extremely useful but then f(x) is understood as a multiplication . If we want that to be interpreted as a function evaluated at a point , we need to declare it as a User function in Input options > Input syntax > Define a new function. Wiris Quizzes 4 documentationThis documentation page has been updated to the latest Wiris Quizzes version. You can find the same information for the previous versions here. Example Let us see a question example This is the well-known statement of the Fibonacci sequence. We ask for two answers: the relation and a particular term of the series. Thus, the Correct answer editor will look like Note that since is marked as a User function, it is shown in blue, as any other elemental function (). This feature is also useful when considering the composition of function questions.