Can someone help me with my math homework?

Discussion in 'After Hours Lounge (Off Topic)' started by PatB, Sep 10, 2003.

  1. PatB

    PatB Stunt Coordinator

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    I'm trying to help someone with this problem but I can't seem to break it, I'm not cheating or anything so it's all on the up and up.



    12y^3-6y^2-42y+28=0

    Solve for y.

    (I don't know if this is the proper way to type this but for example the first part is 12 "y" cubed.)
     
  2. James~P

    James~P Stunt Coordinator

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    factor it or use quadratic equation.
     
  3. PatB

    PatB Stunt Coordinator

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    You can't use a quadratic equation to factor a cubic though.
    I was trying to factor it but that's the problem, I can't seem to do it.
     
  4. James~P

    James~P Stunt Coordinator

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    if i rememberd any of this from 8th grade i'd help more...
     
  5. PatB

    PatB Stunt Coordinator

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    You may want to go back to spelling. [​IMG]

    That's the problem, it's for an 12th grader.
     
  6. Bryan X

    Bryan X Producer

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    -1.9338
     
  7. James~P

    James~P Stunt Coordinator

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    my spelling is sub par late at night when i'm going fast.. that wasnt even what you'd consider spelling.. it was just a typo...



    anyway if you have a palmpilot just download "math pad" and use it to solve the equation
     
  8. Dome Vongvises

    Dome Vongvises Lead Actor

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    Give me a second, I'm working on this.
     
  9. PatB

    PatB Stunt Coordinator

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    Hey Bryan, is that for real or are you just goofing?

    Just a little humour James, math isn't my strong suit.
     
  10. Patrick Sun

    Patrick Sun Studio Mogul

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    The other solution is pretty close to 1.74075.
     
  11. PatB

    PatB Stunt Coordinator

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    What is 1.74075? Is that some kind of magic number?
     
  12. Bryan X

    Bryan X Producer

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    Yep, PatB, that's for real.
     
  13. PatB

    PatB Stunt Coordinator

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    Bryan, can I ask how you got to that result?
     
  14. Dome Vongvises

    Dome Vongvises Lead Actor

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    Well, I've got it simplified down to 6y^3 - 3y^2 - 21y + 14 = 0. That's where I'm stuck.

    I think you'll have to graph this one.
     
  15. Bryan X

    Bryan X Producer

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  16. Tony-B

    Tony-B Producer

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    Pat, make sure it's true by plugging in his answer for Y.

    Sorry if I am stating the obvious, but I just want to make sure that you do that.
     
  17. PatB

    PatB Stunt Coordinator

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    Awww, that's a shame, I need to see what the solution is. It's not about the destination, it's about the journey, in zen-speak.
     
  18. Bryan X

    Bryan X Producer

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  19. PatB

    PatB Stunt Coordinator

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    I'm just trying to help out a friend here, now I'm getting lectured by Bryan. [​IMG]
     
  20. Bryan X

    Bryan X Producer

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    It appears that there is more than one answer however. I've created the equation in Excel and found more than one answer-- depending on how many decimal places you are taking this out to consider zero.
     

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