Newton Raphson Method for cubic equation

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Simple solution for finding roots of a cubic polynomial using Newton Raphson's Method
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It's an enjoyable exercise which I personally never tried before - it's fun to put it up on a spreadsheet and see the result converging - only problem here was the arithmetical error for the initial derivative which should have been 21, not 46. Using the presenter's x=-5 the result converges to 14 decimal places in just 4 iterations! - If you put x=1 then it takes 9 iterations. Thank you very much!

richardleveson
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f(-5) is not correct! so as a result everything is wrong! but the idea to apply the method is correct.

yousify
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This in't even correct, there's more than one root, lmao

Motoko