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mathhelp23

solve 3x^2-5x-11=0 find the x intersepts of f(x)=3x^2-5x-11.

  • 2 years ago
  • 2 years ago

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  1. Hero
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    It's not complex

    • 2 years ago
  2. Hero
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    \[D = b^2 - 4ac = (-5)^2 - 4(3)(-11) = 25 + 132 = 157\]

    • 2 years ago
  3. Hero
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    \[x = \frac{\pm \sqrt{157} + 5}{6}\]

    • 2 years ago
  4. mathg8
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    any method ?

    • 2 years ago
  5. mathhelp23
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    thank you

    • 2 years ago
  6. krypton
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    @Hero that's the answer i got,dat's why i called it a complex root

    • 2 years ago
  7. mathg8
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    @krypton : square root of a negative number gives you a complex number solution

    • 2 years ago
  8. myininaya
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    any number is complex

    • 2 years ago
  9. myininaya
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    4 is complex 4i is complex 4+4i is complex

    • 2 years ago
  10. mathg8
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    4+0i

    • 2 years ago
  11. mathg8
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    why do we have real and complex sets then ?

    • 2 years ago
  12. myininaya
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    real numbers is a subset of the complex imaginary numbers is a subset of the complex

    • 2 years ago
  13. myininaya
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    all numbers are complex

    • 2 years ago
  14. mathg8
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    If a complex number has b = 0, then it is a real number and it lies on the real axis in the complex plane

    • 2 years ago
  15. myininaya
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    Definition of Complex: \[Complex =\{a+bi | a \in \mathbb{R} , b \in \mathbb{R}\}\]

    • 2 years ago
  16. Hero
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    Define complex in words only without using mathematical notation.

    • 2 years ago
  17. Hero
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    What a meant to say is that the discriminant yields a real number, not a complex number. The definition of a complex number is a + bi

    • 2 years ago
  18. mathg8
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    The real line can be thought of as a part of the complex plane, and correspondingly, complex numbers include real numbers as a special case.

    • 2 years ago
  19. mathg8
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    ... Special Case

    • 2 years ago
  20. Hero
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    That's good to know. I'm not the one confused about it.

    • 2 years ago
  21. myininaya
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    Excuse me?

    • 2 years ago
  22. myininaya
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    I'm not confused either.

    • 2 years ago
  23. Hero
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    I know you're not myininaya. I never said you were :P

    • 2 years ago
  24. mathg8
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    def : A complex number is neither purely real nor purely imaginary, but rather is a composite of the two ! Happy everyone ?

    • 2 years ago
  25. myininaya
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    Ok I guess I just understood you. sorry hero. :)

    • 2 years ago
  26. myininaya
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    misunderstood you* lol

    • 2 years ago
  27. myininaya
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    real numbers are complex imaginary numbers are complex real numbers+imaginary numbers are still complex

    • 2 years ago
  28. Hero
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    she avoided using the word "pure" in her definitions.

    • 2 years ago
  29. myininaya
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    http://en.wikipedia.org/wiki/Complex_number

    • 2 years ago
  30. Hero
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    So myininaya, which numbers are purely complex?

    • 2 years ago
  31. myininaya
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    I don't have a definition for "purely" complex numbers as I never heard of any set of numbers being defined at such sorry

    • 2 years ago
  32. mathg8
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    check out this book : An imaginary tale The Story of √-1 by Paul J. Nahim ( Professor Emeritus of Electrical Engineering at the University of New Hampshire )

    • 2 years ago
  33. Hero
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    Guess there's no such thing as a pure complex number since it is a "mixture" of pure real and pure imaginary.

    • 2 years ago
  34. mathg8
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    4 is real 4+0i is complex

    • 2 years ago
  35. myininaya
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    4=4+0i

    • 2 years ago
  36. myininaya
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    4/2 is an integer just like 2 is

    • 2 years ago
  37. myininaya
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    because 4/2=2

    • 2 years ago
  38. myininaya
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    @jamesj @zarkon

    • 2 years ago
  39. Hero
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    Why are you two reciting stuff you already know? Because I already know this stuff

    • 2 years ago
  40. mathg8
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    |dw:1331351848500:dw|

    • 2 years ago
  41. mathg8
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    this is interesting ... LOL

    • 2 years ago
  42. Hero
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    mathg8, I guess you really want krypton to understand

    • 2 years ago
  43. mathg8
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    I just never heard this before ... so it is interesting ( not wrong or right ) just interesting ...

    • 2 years ago
  44. mathg8
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    real numbers are complex ( i meant this statement )

    • 2 years ago
  45. krypton
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    lol intresting :)

    • 2 years ago
  46. Hero
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    Krypton, I'm sure you enjoyed this

    • 2 years ago
  47. krypton
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    lol yeah! alot,just woke up from sleep and logged in,only to find some argument in here.was fun :)

    • 2 years ago
  48. mathg8
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    yes ... this was fun!

    • 2 years ago
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