$$5x^3 - 21x^2 - 11x + 3 = 0$$
I am not allowed to use a graphical calculator on the exam
2026-02-22 17:45:31.1771782331
How do I find roots of the 3rd order polynomial?
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Either use numerical methods, or graphing calculator, or if you want exact form
see The Cubic Formula, by the way it's too complicated to remember or to evaluate by hand.
I would suggest using Wolfy for this purpose.