How do I create a Desmos parabola by focus and directrix item?
In Mastery Connect, if your institution has a paid Desmos upgrade, you can create a parabola by focus and directrix item. A Desmos parabola by focus and directrix question requires students to graph a parabola by moving points that control the focus and directix. After you select the question type, you can use the math editor to add details for the question, view a student preview, and validate answers.
You can create any item type through the Item Editor. You can also use the Item Editor to add passages, add item-level tools, and save the item. To open and use the Item Editor, learn more about:
- Creating an item in your personal item bank
- Creating an item in the district item bank as an administrator
- Creating an item from within an assessment
Note: If you do not see the Desmos Items (Paid Upgrade) section in the Question Type drop-down menu, your institution does not have a paid Desmos upgrade.
To add question details in the assessment editor, type in the Compose question field . To add math equations and expressions, click the Add Math icon  and use the options to enter the expression details.
Set Example Answer
To set an example answer, click and drag the points of the parabola to the correct positions.
To adjust the question parameters, select options from the question properties .
To view additional question options, click the More options drop-down menu .
Modify Graph and More Options
In the Modify Graph section, click and drag the points to create a graph for students to start with when answering the question . You can modify graph settings, expressions, and parameters.
To define parameters for the graph, type in the Expression fields .
To change the graph settings, click the Graph Settings icon .
To adjust font size, click the Font size menu and select a size option .
To preview the item interaction, click and drag the points .
The number of points awarded for the item as answered in the preview window over the number of points possible display in the scoring bubble .
To view correct and incorrect answers, click the Show Answers checkbox . Correct answers display a check mark and are shaded green. Incorrect answers display an X and are shaded red. If an answer is incorrect, the correct answer displays beneath the response and is shaded yellow.