From here.

To make Hexo be able to render the math formula written in TeX/LaTeX notation, we need to add the “hexo-filter-mathjax” plugin.

First, update the “pacakge.json” file by adding the following line in the “dependencies” section:

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"hexo-filter-mathjax": "^0.9.0",

Then run “npm install” to install it.

Second, update the “_config.yaml” file to add the corresponding configuration:

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mathjax:
  tags: none # or 'ams' or 'all'
  single_dollars: true # enable single dollar signs as in-line math delimiters
  cjk_width: 0.9 # relative CJK char width
  normal_width: 0.6 # relative normal (monospace) width
  append_css: true # add CSS to pages rendered by MathJax
  every_page: false # if true, every page will be rendered by MathJax regardless the `mathjax` setting in Front-matter
  packages: # extra packages to load
  extension_options: {}

The last step is to add the following “front-matter” line into the post which contains the math formula written in TeX/LaTeX notation:

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mathjax: true

After that in the post you can write the formula like below:

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# https://en.wikibooks.org/wiki/LaTeX/Mathematics
$x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$

The rendered result looks like:

Done.