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ELEEWS33 Group Title

Solve for x: x^3 -x^2 +x=8

  • one year ago
  • one year ago

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  1. Mertsj Group Title
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    Subtract 8 from both sides. List the possible rational roots and use synthetic division.

    • one year ago
  2. ELEEWS33 Group Title
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    what is synthetic division?

    • one year ago
  3. Mertsj Group Title
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    |dw:1358823297466:dw|

    • one year ago
  4. ELEEWS33 Group Title
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    still confused as to what that was.... please re-explain. I don't understand the image.

    • one year ago
  5. Mertsj Group Title
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    Perhaps you have never studied synthetic division. What class are you taking?

    • one year ago
  6. Azteck Group Title
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    divide that polynomial by (x-2)

    • one year ago
  7. ELEEWS33 Group Title
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    Alg 2 and trig

    • one year ago
  8. Azteck Group Title
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    I will tell you why I told you to divide by x-2

    • one year ago
  9. Azteck Group Title
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    You have to test a number in that polynomial so that x^3-x^2+x-8=0 is true.

    • one year ago
  10. Mertsj Group Title
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    It won't do any good to divide by x-2 since x-2 is not a factor.

    • one year ago
  11. Azteck Group Title
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    if you substitute 2 for x then you get 0=0 which means 2 is a root of that polynomial.

    • one year ago
  12. Mertsj Group Title
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    Check your work Azteck. 2 is NOT a root

    • one year ago
  13. Azteck Group Title
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    Ah yes. You're right.

    • one year ago
  14. ELEEWS33 Group Title
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    hey.. guys?! I'm still really confused as to how I'm supposed to solve this...

    • one year ago
  15. Mertsj Group Title
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    There is one real root of approximately 2.2 and 2 complex roots. That's from Wolfram

    • one year ago
  16. Mertsj Group Title
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    So perhaps you could solve it with a graphing calculator.

    • one year ago
  17. Mertsj Group Title
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    Are you allowed to use technology?

    • one year ago
  18. ELEEWS33 Group Title
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    um... I still don't understand how to find x myself... without wolframalpha...

    • one year ago
  19. Mertsj Group Title
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    You could graph it. You could substitute values until the function changes signs and then zero in on the answer by making and checking successive guesses.

    • one year ago
  20. ELEEWS33 Group Title
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    But I have to solve it algebraically

    • one year ago
  21. Mertsj Group Title
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    Sorry. I can't help you with that. Better page Satellite73

    • one year ago
  22. Mertsj Group Title
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    He's the brains of this outfit.

    • one year ago
  23. ELEEWS33 Group Title
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    could you shoot him a message for me, I've not come accross him so I can't contact him.

    • one year ago
  24. Azteck Group Title
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    @satellite73

    • one year ago
  25. Azteck Group Title
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    He will get to you now.

    • one year ago
  26. Azteck Group Title
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    or later*

    • one year ago
  27. ELEEWS33 Group Title
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    shoot. He doesn't accept messages from anyone he hasn't fanned :(

    • one year ago
  28. kirbykirby Group Title
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    This is quite difficult without software lol. Did you see the EXACT forms of the solution... one mega expression!!

    • one year ago
  29. kirbykirby Group Title
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    the real root, for example, is this: 1/3*(1-2 (2/(209+3 sqrt(4857)))^(1/3)+(1/2 (209+3 sqrt(4857)))^(1/3))

    • one year ago
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