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    Does anyone know an equation that can be used in the Newton-Raphson method for C3 coursework??

    For all the ones I could find, my calculator and Excel did not display enough figures to get an accurate answer.

    The equation must include at least x³ and have non-integer roots.

    Thank you!
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    Sorry, I don't understand the question. What does the coursework involve?

    As I understand, the Newton-Raphson method gives a series of approximations in the form x_{n+1} = x_n - \frac{f(x_n)}{f'(x_n)}.
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    Sorry, it was a bit confusing.

    Basically, we have to take an equation and find the three roots - where y=0.

    In the Newton-Raphson, you put an estimate for the root into the equation you gave above. The answer is put into the equation again and so on.

    I just want an equation to start with as some take longer than other to find an accurate root, and with the equations I tried, my calculator does not show enough digits for the method to work.
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    I'm not understanding the problem. You just want us to give you a cubic equation to solve?
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    Not exactly... I don't think I can explain properly if you haven't done this coursework. I might try at school to find someone who did it last year. Thanks for trying, anyway.
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    Well, you could try explaining it to me the way your teacher explained it to you.
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    Most cubics will work for this.

    I assume you're using the ANS button on your calculator to make things easier.

    Post the equation you're trying to use and we can have a look where things are going wrong.
 
 
 
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Updated: July 9, 2007

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