You might want to enter a mathematical or scientific expression into an assignment, into the edX calculator tool, or into a course discussion.
For assignments in the body of the course and for the calculator tool, you enter plain text, and the edX system then converts your text into numbers and symbols that appear below the response field.
Entering math expressions in course discussions is different from entering math expressions in a math problem or in the calculator. In course discussions, you use MathJax to format the text that you type. For detailed information about how to enter math expressions in course discussions, see Math Formatting in Course Discussions in the DemoX course.
Note: For information about using screen readers in assignments containing mathematical expressions, see Completing mathematical problems using screen readers.
Both the calculator and the response fields in math problems accept a selection of characters that represent numbers, operators, constants, functions, and other mathematical concepts. You might recognize parts of this system if you have used math programs before.
If your course offers the calculator tool, the calculator appears as a small icon on all pages in the body of the course. To open the calculator, select the calculator icon. To close the calculator, select the X that appears when the calculator is open.
The calculator includes an information page that shows an abbreviated version of the information in this topic. To see the information page, select the circled i icon next to the input field.
When you enter your plain text into the calculator or the response field, follow these guidelines.
Note: The edX system accepts both constants and metric affixes. Be careful to distinguish between constants and metric affixes. Constants stand alone, while metric affixes must be combined with numbers. For example, c can be a constant representing the speed of light or a metric affix meaning “centi”. When you use c as a metric affix, do not include a space between c and the number. When you use c as a constant, indicate multiplication explicitly. The following examples show the difference:
For more information, see these other topics: