Problem with cubic roots

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I am a retired engineer reviving my knowledge of programs.

Cubic equation a=2,b=-3,c=-3,d=2
I get D=729, sqrt(D)=27 p=-2.25, q=0

I know the roots from the graph to be -1;0.5;2 but using the code in your paper with Basic I get different answers.
Please let me have suggestions where I am going wrong. Is your code Java or Javascript?

What I have tried:

I am still learning Java Script so I used Basic to compute the answers. Perhaps there is something about basic which screws up cude roots??

Posted 13-Oct-17 8:17am

Member 13459826

Updated 13-Oct-17 8:43am

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Patrice T 13-Oct-17 14:32pm

There is a forum at the end of articles, should be the place to start with.
to get help in this forum, show your code.

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OriginalGriff · Answer 1 · 2017-10-13T08:43:00

Don't post this under Quick Answers - if you got the code from an article, then there is a "Add a Comment or Question" button at the bottom of that article, which causes an email to be sent to the author. They are then alerted that you wish to speak to them.

Posting this here relies on them "dropping by" and realising it is for them - the rest of us have no idea what article of the hundred thousand or so article on this site, written by any of 13,000,000 members you are referring to...