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anonymous

  • 5 years ago

Show that the equation has a root in the given interval: 3x^3-2x^2+5x+4=0 [-1,0] The book I have explains nothing...

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  1. amistre64
    • 5 years ago
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    We would have to factor it into is baser parts; like 12 factors in 4 and 3

  2. amistre64
    • 5 years ago
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    we can try to find a way to group it into parts that would work; but thats as much trial and error as my way :)

  3. amistre64
    • 5 years ago
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    One method is to solve the equation for -1 and then for 0 and if there is a switch in signs; then it crosses the axis

  4. anonymous
    • 5 years ago
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    who hs gmail

  5. anonymous
    • 5 years ago
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    go to that

  6. myininaya
    • 5 years ago
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    do f(-1) and do f(0) if one is positive and one is negative then there is root on the interval -1..0

  7. amistre64
    • 5 years ago
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    like this example

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  8. anonymous
    • 5 years ago
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    who `has gmail

  9. anonymous
    • 5 years ago
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    http://uk.answers.yahoo.com/question/index?qid=20110324085500AAVlcai - This link will have the answer.

  10. anonymous
    • 5 years ago
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    Okay, i'm with you

  11. anonymous
    • 5 years ago
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    amistre pz go tothis link https://docs.google.com/document/d/1wPX_UwJrMAKjHc4j4mLkHwrL0rTr8ySI0m9u1KxxX2E/edit?hl=en&authkey=CMa9-_EO&pli=1#

  12. anonymous
    • 5 years ago
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    Use the Intermediate Value Theorem to check for the existence of zeros (like myininaya said). If f(x) is continuous on [a, b] and if f(a) and f (b) are nonzero and have opposite signs, then f(x) has a zero in (a, b).

  13. anonymous
    • 5 years ago
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    amistre plz go to this link https://docs.google.com/document/d/1wPX_UwJrMAKjHc4j4mLkHwrL0rTr8ySI0m9u1KxxX2E/edit?hl=en&authkey=CMa9-_EO&pli=1#

  14. amistre64
    • 5 years ago
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    3(-1)^3-2(-1)^2+5(-1)+4 = ?? -3 -2 -5 +4 = -6 3(0)^3-2(0)^2+5(0)+4 = +4 Since -6 and 4 differ by "sign" the function has to cross the xaxis at some point in the interval between [-1,0]

  15. anonymous
    • 5 years ago
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    Wow, I sure wish the book explained this stuff.

  16. anonymous
    • 5 years ago
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    ammmmmmmmmmmmmmmmmmmmmmmmmmistrrrrrrrrrrrrrrrrre6444444444444444444444444444444

  17. amistre64
    • 5 years ago
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    mary; please do not disrupt other peoples learning environment. If you do not have anything to contribute to the question at hand, please dont comment... thank you.

  18. anonymous
    • 5 years ago
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    :)

  19. anonymous
    • 5 years ago
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    but plz go to this link come on https://docs.google.com/document/d/1wPX_UwJrMAKjHc4j4mLkHwrL0rTr8ySI0m9u1KxxX2E/edit?hl=en&authkey=CMa9-_EO&pli=1#

  20. amistre64
    • 5 years ago
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    email it to me, because it doesnt come out on my end....

  21. anonymous
    • 5 years ago
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    whats your gmail

  22. amistre64
    • 5 years ago
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    Jenn: Does that explanation make sense for you? If you start on one side of the road and end up on the other side; youd have to have crossed the road at some point right?

  23. amistre64
    • 5 years ago
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    same as it was last time :) tony031172@gmail.com

  24. anonymous
    • 5 years ago
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    Yes, it makes more sense. This one is not as bad as the other one you helped me with.

  25. anonymous
    • 5 years ago
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    plz check your mail now

  26. amistre64
    • 5 years ago
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    lol...not as many chances to mess it up ;)

  27. anonymous
    • 5 years ago
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    ok

  28. anonymous
    • 5 years ago
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    Too funny..i have several more of those as well, so i'll try it

  29. anonymous
    • 5 years ago
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    If I do them, will you let me know if the answer are right? Again,please..i can post them again too if you'd like

  30. amistre64
    • 5 years ago
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    mary; the assassination of lincoln again? no thnx :)

  31. amistre64
    • 5 years ago
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    We all can check ;)

  32. anonymous
    • 5 years ago
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    Great...thank you so very much.

  33. amistre64
    • 5 years ago
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    there no I in team, but there is an atem..and meat... and ate, tea eat, met, and other useful yet trivial words :)

  34. anonymous
    • 5 years ago
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    i need you to help me on google doc

  35. anonymous
    • 5 years ago
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    i needdd your hep

  36. amistre64
    • 5 years ago
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    mary: helps is the operative word there. I am good at math, lincolns assassination, while it was a long time ago, still happened a few years before me :)

  37. anonymous
    • 5 years ago
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    but plz go to gmail

  38. amistre64
    • 5 years ago
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    its blank....

  39. anonymous
    • 5 years ago
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    i nived you to my google doc

  40. anonymous
    • 5 years ago
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    amistre why you left

  41. anonymous
    • 5 years ago
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    so mean ou can help me an dget this done

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is replying to Can someone tell me what button the professor is hitting...

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