# General roots of cubic polynomial with perturbed R

**URL:** <https://fortran-lang.discourse.group/t/general-roots-of-cubic-polynomial-with-perturbed-r/423>\
**Category:** Uncategorized\
**Created:** [November 17, 2020, 9:31pm UTC](https://fortran-lang.discourse.group/t/general-roots-of-cubic-polynomial-with-perturbed-r/423 "2020-11-17T21:31:57Z")\
**Posts on this page:** 1\
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**Author:** ![FortranFan](https://avatars.discourse-cdn.com/v4/letter/f/96bed5/32.png) [@FortranFan](https://fortran-lang.discourse.group/u/FortranFan)\
**Post date:** [November 17, 2020, 9:51pm UTC](https://fortran-lang.discourse.group/t/general-roots-of-cubic-polynomial-with-perturbed-r/423/2 "2020-11-17T21:51:27Z")

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@Justin,

Have you looked at this [**thread**](https://fortran-lang.discourse.group/t/cardanos-solution-of-the-cubic-equation/111)? That should give you an immediate starting point which you can use in conjunction with discussions in many texts on numerical methods.

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