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Math Help - how can i solve this ??

  1. #1
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    how can i solve this ??

    i want the way to solve this equation without using calculator to find value of x
    x3 + ax2 + bx + c
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  2. #2
    Senior Member yeKciM's Avatar
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    Quote Originally Posted by mido22 View Post
    i want the way to solve this equation without using calculator to find value of x
    x3 + ax2 + bx + c
    hm... check what did you wrote there ... (first are those x2 x3  x_2 , x_3 or are they just  3x, 2x , and where is there equation )
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  3. #3
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    Quote Originally Posted by yeKciM View Post
    hm... check what did you wrote there ... (first are those x2 x3  x_2 , x_3 or are they just  3x, 2x , and where is there equation )
    they are x^3 + (a*x^2) + (b*x) + c =0
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  4. #4
    Senior Member yeKciM's Avatar
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    Quote Originally Posted by mido22 View Post
    they are x^3 + (a*x^2) + (b*x) + c =0
     x^3+ax^2+bx+c =0

    if you looking for formula to solve that in that form than.... hm... it's huge if those i assume constants a,b,c were numbers than could be shown how to reduce that equation so it could be solved easier

    or you can use Horner scheme , but anyway you need one zero first
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  5. #5
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    Quote Originally Posted by yeKciM View Post
     x^3+ax^2+bx+c =0

    if you looking for formula to solve that in that form than.... hm... it's huge if those i assume constants a,b,c were numbers than could be shown how to reduce that equation so it could be solved easier

    or you can use Horner scheme , but anyway you need one zero first
    here is the problem link :
    https://www.spoj.pl/problems/ROOTCIPH/

    what is your idea
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  6. #6
    Senior Member yeKciM's Avatar
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    Quote Originally Posted by mido22 View Post
    here is the problem link :
    https://www.spoj.pl/problems/ROOTCIPH/

    what is your idea
    hm.....

    try this if helps you : x^3+ax^2+bx+c=0 - Wolfram|Alpha

    and here you are how to do cubic polynomial : Solving Cubic Equations


    hm.... or because your are writing code for that, maybe it would be easier to test first zero, and than simplify cubic polynomial... as i recall you can use algorithm hm... can't remember right now but as soon as i do i'll write it here (long time passed since i have done any programming )
    Last edited by yeKciM; September 6th 2010 at 03:07 PM.
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  7. #7
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    Quote Originally Posted by yeKciM View Post
    hm.....

    try this if helps you : x^3+ax^2+bx+c=0 - Wolfram|Alpha

    and here you are how to do cubic polynomial : Solving Cubic Equations


    hm.... or because your are writing code for that, maybe it would be easier to test first zero, and than simplify cubic polynomial... as i recall you can use algorithm hm... can't remember right now but as soon as i do i'll write it here (long time passed since i have done any programming )
    ok take your time but don't forget me
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