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InsanelyChaotic

  • 3 years ago

Solve x2 + 6x + 7 = 0. Options are below!!!

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  1. InsanelyChaotic
    • 3 years ago
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  2. InsanelyChaotic
    • 3 years ago
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  3. InsanelyChaotic
    • 3 years ago
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  4. InsanelyChaotic
    • 3 years ago
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  5. hartnn
    • 3 years ago
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    know quadratic formula ?

  6. hartnn
    • 3 years ago
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    Compare your quadratic equation with \(ax^2+bx+c=0\) find a,b,c then the two roots of x are: \(\huge{x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}}\)

  7. Yahoo!
    • 3 years ago
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    \[\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

  8. InsanelyChaotic
    • 3 years ago
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    How do I apply that to this problem? Like i'm having trouble setting it up

  9. hartnn
    • 3 years ago
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    none of the options are correct b^2-4ac = 36-28 = 8 so there should be sqrt 8 in options or sqrt 2

  10. hartnn
    • 3 years ago
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    couldn't u find, a,b,c ?

  11. InsanelyChaotic
    • 3 years ago
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    Those are the only options.......

  12. hartnn
    • 3 years ago
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    then your question must be incorrect

  13. hartnn
    • 3 years ago
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    check it

  14. hartnn
    • 3 years ago
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    also see your previous question

  15. hartnn
    • 3 years ago
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    for this its, (-6+- sqrt 8)/2 = (-3+- sqrt2)

  16. InsanelyChaotic
    • 3 years ago
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    Solve x2 + 6x + 7 = 0

  17. hartnn
    • 3 years ago
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    for that (-3+- sqrt2)

  18. InsanelyChaotic
    • 3 years ago
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    Oh my goodnes!!!!1 I'm SO sorry

  19. InsanelyChaotic
    • 3 years ago
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    i see what occurred

  20. InsanelyChaotic
    • 3 years ago
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    the question is: Solve 3x2 + 4x = 2

  21. hartnn
    • 3 years ago
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    right, 3x^2+4x-2=0 now apply the formula can u find,a,b,c first ?

  22. InsanelyChaotic
    • 3 years ago
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    3, 2, 4?

  23. hartnn
    • 3 years ago
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    |dw:1352747869498:dw|

  24. InsanelyChaotic
    • 3 years ago
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    a = 3 b = 4 c = -2

  25. hartnn
    • 3 years ago
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    yes. now what is b^2-4ac = ?

  26. InsanelyChaotic
    • 3 years ago
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    one moment

  27. InsanelyChaotic
    • 3 years ago
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    16 - 4(3)(-2)???

  28. InsanelyChaotic
    • 3 years ago
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    four times a c? or four times a times c?

  29. hartnn
    • 3 years ago
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    yes, evaluate that

  30. InsanelyChaotic
    • 3 years ago
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    It equals 40

  31. hartnn
    • 3 years ago
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    yes, now put all values in formula and tell me what u get for x.

  32. InsanelyChaotic
    • 3 years ago
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    ok

  33. InsanelyChaotic
    • 3 years ago
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    This is how I set it up: -4+sq root 4^2-4(3)(-2)/2(3)

  34. InsanelyChaotic
    • 3 years ago
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    = 36

  35. InsanelyChaotic
    • 3 years ago
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    @hartnn

  36. hartnn
    • 3 years ago
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    x1=[-4 + sqrt (40)] / (2*3) = ? x2=[-4 - sqrt (40)] / (2*3) = ?

  37. hartnn
    • 3 years ago
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    got that ^ ?

  38. InsanelyChaotic
    • 3 years ago
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    Yes!! :)

  39. hartnn
    • 3 years ago
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    got final answer then ?

  40. InsanelyChaotic
    • 3 years ago
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    3.7

  41. InsanelyChaotic
    • 3 years ago
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    -13.4 for the second

  42. hartnn
    • 3 years ago
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    from the options ? 3.7 is not in options keep sqrt 40 as 2sqrt 10 only

  43. InsanelyChaotic
    • 3 years ago
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    option b

  44. hartnn
    • 3 years ago
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    absolutely correct! got it ?

  45. InsanelyChaotic
    • 3 years ago
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    YES!!!!!!!!!!!! It makes sense! why couldn't I see that on my own?? Thank you!!!!!!

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