How to write maths equation in html language?

Question

I want to write square root of b square minus 4 a c.

Answer 1

http://www.scientificpsychic.com/etc/square-root.html

Answer 2

use the <sub> & <sup> tags

<sub> - used for downscript
<sup> - used for upscript

Answer 3

Here's a working code:

https://code.sololearn.com/W96RxkCGpkNM/?ref=app