Question 1095186
.
If you are so interested in mastering the Cardano method,


I found for you a brilliant exposure of this method in the Internet.


See the link <A HREF=https://people.math.osu.edu/derdzinski.1/courses/4552/4552-cubic-quartic.pdf>https://people.math.osu.edu/derdzinski.1/courses/4552/4552-cubic-quartic.pdf</A>


https://people.math.osu.edu/derdzinski.1/courses/4552/4552-cubic-quartic.pdf



It is quite elementary, and you will get much fun reading it.



Good luck and Happy learning !!