If you want to **write mathematical formulas** on WeSchool in a clear and precise way - from the simplest to the more complex - the best choice is to use LaTeX (https://www.latex-project.org/)

LaTeX can be used:

- Inside our
**text editor**(such as to add a text to a post or in a Module)

In **all the test questions** highlighted below, and in the answers to a Multiple-Choice question and in the matching terms of a Match the Pairs:

To write a mathematical formula with LaTeX, you need two things:

- First,
**use a precise delimiter**to indicate that you want to write a formula - Write the formula inside the delimiters, with the
**appropriate commands**

**LaTeX delimiters**

Delimiters behave like parentheses: everything inside them will be interpreted as a command and **transformed into a formula**. There are two delimiters you can use on WeSchool to indicate a mathematical formula:

- the
**dollar**($... $) - The
**double dollar**($$... $$)

For example, writing $ x + y $ we will get:

What is the difference between the dollar and the double dollar? The dollar puts the formula **in line with the text**, while the double dollar places it **in the center of the page**.

**LaTeX commands**

To write a mathematical formula we can type it normally: some symbols (such as +, - and =, the letters of the alphabet and others) do not need a particular command to be entered. In practice, with LaTeX we can **write a literal expression without any issues**. Many other components of a mathematical formula, such as an exponent or a fraction, must be entered via a command. Below is a **list of the most frequently used commands** and an example of how to use them on WeSchool.

*Exponents and subscripts*

An **exponent** is obtained with the **caret character ^,** a **subscript** with the **underscore****character _.** If what we have to put in the exponent or subscript is longer than a single character, we need to **put it in brackets**. For example:

*Multiplications and fractions*

The multiplication symbol is achieved with the **\ times** command for a **“for”** symbol or with **\cdot** for a **dot**. A fraction, on the other hand, is written using the **\frac{N}{D}** command, where for **N** we will have the **numerator** and for **D** the **denominator**; of course, the numerator and denominator can themselves be complicated expressions. For example:

*Roots*

The square roots are indicated with the command **\sqrt{R},** where **R** is the **radicand**. If you wish to indicate a root of a particular order, other than 2, the command is **\sqrt[n]{R}** instead, with **n** the chosen index. For example:

The number of symbols and commands that can be used with LaTeX is vast. A list of the most used symbols can be found at this address. To check if the formula you wrote in LaTeX is correct, you can conveniently use this tool.