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DeadShot

  • one year ago

What are the possible number of positive, negative, and complex zeros of f(x) = 3x^4 - 5x^3 - x^2 - 8x + 4 ?

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  1. .Sam.
    • one year ago
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    Well, if they just want the number of roots, then it will be a total of 4 , 2 complex, 2 reals

  2. DeadShot
    • one year ago
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    My teacher wants the possible number of positive real, negative real, and complex. Knowing that there are 2 complex zeroes narrows down the answer.

  3. DeadShot
    • one year ago
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    Is the number of positive real 3 or 1 and the negative 1, or is it vice versa?

  4. .Sam.
    • one year ago
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    Then apply Descartes' Rule, have you learn that before?

  5. .Sam.
    • one year ago
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    I have to go now, there's a tutorial on that here: http://www.purplemath.com/modules/drofsign.htm Try it out :)

  6. DeadShot
    • one year ago
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    Ok

  7. DeadShot
    • one year ago
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    Got it! Thanks!

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