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jmallis

  • 2 years ago

The graph of the function has more than one turning point. Use the graphing calculator to find the coordinates of the turning point that lies in the given interval. f(x)= 7x^3 -9x^2 -x+1, [-1, 10] The coordinates of the turning point are

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  1. TuringTest
    • 2 years ago
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    Is this calculus?

  2. jmallis
    • 2 years ago
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    College Algebra

  3. sauravshakya
    • 2 years ago
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    Find f'(x)

  4. TuringTest
    • 2 years ago
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    The asker said algebra, so presumably that means no calculus allowed.

  5. jmallis
    • 2 years ago
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    So what do I do?

  6. TuringTest
    • 2 years ago
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    it would certainly be a much easier calculus problem not sure I know a method for this using only algebra, I'll have to think on it...

  7. jmallis
    • 2 years ago
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    ok

  8. sauravshakya
    • 2 years ago
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    Graph it

  9. TuringTest
    • 2 years ago
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    that's all I can think of too

  10. jmallis
    • 2 years ago
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    And the calculus way?

  11. TuringTest
    • 2 years ago
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    find x=a such that f'(a)=0

  12. TuringTest
    • 2 years ago
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    ...in the given interval

  13. cinar
    • 2 years ago
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    http://www.wolframalpha.com/input/?i=plot+y%3D7x^3+-9x^2+-x%2B1

  14. jmallis
    • 2 years ago
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    ok so what would the coordinates of the turning point?

  15. cinar
    • 2 years ago
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    It says "Use the graphing calculator to find the coordinates of the turning point that lies in the given interval"

  16. TuringTest
    • 2 years ago
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    wow I managed to not even read the post :P thanks cinar

  17. jmallis
    • 2 years ago
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    I dont have one

  18. cinar
    • 2 years ago
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    (:

  19. TuringTest
    • 2 years ago
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    the website wolfram alpha is a pretty good one http://www.wolframalpha.com/

  20. TuringTest
    • 2 years ago
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    that site serves as a graphing calculator

  21. jmallis
    • 2 years ago
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    laptop blocked it

  22. cinar
    • 2 years ago
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    http://answers.yahoo.com/question/index?qid=20091030113220AAieoZy

  23. TuringTest
    • 2 years ago
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    that method again requires calculus your three options are to buy the graphing calculator, get wolfram working on your laptop, or learn calculus besides that I have no ideas

  24. cinar
    • 2 years ago
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    I guess you have to use derivative

  25. cinar
    • 2 years ago
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    they are roughly (0.9,-2) (0.1,1) but exactly

  26. jmallis
    • 2 years ago
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    It was (-0.05, 1.03)

  27. cinar
    • 2 years ago
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    http://www.wolframalpha.com/input/?i=max+y%3D7x^3+-9x^2+-x%2B1

  28. TuringTest
    • 2 years ago
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    wolfram disagrees o_O

  29. cinar
    • 2 years ago
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    http://www.wolframalpha.com/input/?i=min+y%3D7x^3+-9x^2+-x%2B1

  30. cinar
    • 2 years ago
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    that's right, I just used my eyes (:

  31. cinar
    • 2 years ago
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    (-0.05,1.03) and (0.91,-2.09) these are your answer..

  32. cinar
    • 2 years ago
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    I made typo for this they are roughly (0.9,-2) (0.1,1) but exactly

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