How do i input this on MATLAB

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Nate
Nate on 5 Jul 2022
Commented: Image Analyst on 13 Jul 2022
How can i input x^3+px+q=0 on MATLAB and find x in terms of p & q?
  1 Comment
Image Analyst
Image Analyst on 13 Jul 2022
Original question in case he edits this one away:
How can i input x^3+px+q=0 on MATLAB and find x in terms of p & q?

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Answers (1)

John D'Errico
John D'Errico on 5 Jul 2022
Ran in:
Assuming that p and q are real numbers, do you understand there will ALWAYS be three solutions to the problem, and that for many values of p and q, exactly two of those solutions will be complex valued?
cubicroots = @(p,q) roots([1 0 p q]);
format long
cubicroots(2,3)
ans =
0.500000000000000 + 1.658312395177701i 0.500000000000000 - 1.658312395177701i -1.000000000000000 + 0.000000000000000i

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