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- TeX
### TeX

### Example

**Warning.**If you copy TeX code directly from the pages herein, retype the following character sequences: \[, \], \(, \) and $$, that is, do not copy these sequences (because they may contain a hidden character for display).## References

- The Not So Short Introduction to LaTeX 2ε

by Tobias Oetiker, Hubert Partl, Irene Hyna and Elisabeth Schlegl - User’s Guide for the amsmath Package (Version 2.1)

by the American Mathematical Society - TeX on Wikipedia
- Using TeX notation on MoodleDocs
- TeX notation filter on MoodleDocs

- The Not So Short Introduction to LaTeX 2ε
## Variables in TeX expressions

### Example

Substitute the numerical values , and in the equation

then display the equation in the text field. Use the TeX notation.

Variables Global variables a=4; b=3; c=7.1; Main question Question text! \({a}x^2 + {b}x + {c} = 0\)

{a}, {b} and {c} will be substituted by the numerical value of , and , respectively, and the following equation will be displayed in the question field:

### Example

Use variables and expressions in the equations of the main question text, the general feedback and the part's feedback. Use the TeX notation.

## Question settings

The Formulas question should look like this:

Note that answers can be given as -5 and 3, or 3 and -5. See Answers in one order or another.