How to write the square root symbol in LaTeX?

How to write the square root symbol in LaTeX?

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This article aims to show you the simplest and easiest way to write the square root symbol in LaTeX.

If you work with LaTeX you probably know the square root, and today you will learn how to insert it in your document.

Square Root Symbol

The square root of some number a is another number b whose square is a, that being said, multiplying b twice results in a, b^2 = a. To represent square roots we use what is called the radical sign or radix, which is 

Square root symbol in LaTeX : Image source: scijournal Author
Image source: scijournal Author

Square Root in LaTeX

In LaTeX luckily you don’t need packages for the square root. You call the square root command in math mode, by writing \sqrt{}. This command takes one value as argument, for example

    $$\sqrt{4} = 2$$
    $$\sqrt{X} = Z$$
Square root symbol in LaTeX : \sqrt command. Image source: scijournal Author
\sqrt command. Image source: scijournal Author

The square root is also used to solve a quadratic equation

    For $ax^2 + bx + c$ we have \\
    $x = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}$
Square root symbol in LaTeX : Quadratic formula. Image source: scijournal Author
Quadratic formula. Image source: scijournal Author

Nth Root

As you probably already know, the root of numbers are not limited to the square root, we also have the cube root or the nth root of some number. 

For the cubic and nth root the command adds another parameter, the command is \sqrt[#1]{#2} now it takes two arguments, #1 refers to the root value or the root power and #2 to the argument inside the root (the expression).

For example,

    $$\sqrt[3]{27} = 3 \rightarrow 3^3 = 27$$
    $$\sqrt[n]{x} = y \rightarrow y^3 = x$$
Square root symbol in LaTeX : Image source: scijournal Author
Image source: scijournal Author

Now you know how the LaTeX code for the square, cube and nth root. It is time to put the knowledge into practice. 

I hope you found this tutorial helpful, and as always keep writing in LaTeX. 

All the images were created in LaTeX by: “name of the author”

Further Reading

LaTex Tutorial on Symbols

  1. How To Create A Cross Product Symbol In LaTeX
  2. How to create a hat symbol in LaTeX?
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  27. How To Write The Greater Than Or Equal To Symbol In LaTeX?
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SJ Tsai
Chief Editor. Writer wrangler. Research guru. Three years at scijournal. Hails from a family with five PhDs. When not shaping content, creates art. Peek at the collection on Etsy. For thoughts and updates, hit up Twitter.

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