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 $f times x$ . If we want that to be interpreted as a function $f$ evaluated at a point $x$ , we need to declare it as a User function in Validation > General > Options for general.

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 tab will look like

Note that since $f$ is marked as a User function, it is shown in blue, as any other elemental function ( $sin comma space cos comma space...$ ).

This feature is also useful when considering composition of functions questions.