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anonymous

  • one year ago

Solve 3x2 + 4x = 2.

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  1. anonymous
    • one year ago
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    I will fan and medal

  2. anonymous
    • one year ago
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    Is the 3x squared? is it 3x^2+4x=2

  3. anonymous
    • one year ago
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    yes

  4. anonymous
    • one year ago
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    Does it tell you how it wants it solved? Like a specific way?

  5. anonymous
    • one year ago
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    the quadratic formula

  6. anonymous
    • one year ago
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    do you know the formula by heart?

  7. anonymous
    • one year ago
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    x=-b+/- sqrt b^2 -4(a)(c) all over 2(a)

  8. anonymous
    • one year ago
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    yes

  9. anonymous
    • one year ago
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    Ok so first you need to set your equation equal to zero

  10. anonymous
    • one year ago
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    3x2+4x-2=0

  11. anonymous
    • one year ago
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    good. Now do you know your values for a, b, and c?

  12. anonymous
    • one year ago
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    Plug them into the equation?

  13. anonymous
    • one year ago
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    Yes

  14. anonymous
    • one year ago
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    (-3 \[\pm \sqrt{16 +24}) / 6\]

  15. anonymous
    • one year ago
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    the two lines are in continuation

  16. anonymous
    • one year ago
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    It should look like x=-4\[\pm \sqrt{4^2-4(3)(-2)}\] over 2(3)

  17. anonymous
    • one year ago
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    So would it be -2 plus radical 10 all over 3|dw:1434907050388:dw|

  18. anonymous
    • one year ago
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    How did you get that?

  19. anonymous
    • one year ago
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    \[-4+\sqrt{}\]40

  20. anonymous
    • one year ago
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    \[x=-4\pm \sqrt{16+24} \over 6\]

  21. anonymous
    • one year ago
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    -4 plus or negative radical 40 all over 6

  22. anonymous
    • one year ago
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    yes

  23. anonymous
    • one year ago
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    Yes. then I simplifed

  24. anonymous
    • one year ago
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    a=3; not 4

  25. anonymous
    • one year ago
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    was I right?

  26. anonymous
    • one year ago
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    I used a=3

  27. anonymous
    • one year ago
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    What did you simplify to?

  28. anonymous
    • one year ago
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    -2 plus/negative radical 10/3

  29. anonymous
    • one year ago
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    |dw:1434907346795:dw|

  30. anonymous
    • one year ago
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    How did you get there?

  31. anonymous
    • one year ago
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    no uhmwhat... u wrote -4 in two consecutive comments

  32. anonymous
    • one year ago
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    Where?

  33. anonymous
    • one year ago
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    guys? Was I right??

  34. anonymous
    • one year ago
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    let me check

  35. anonymous
    • one year ago
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    your answer should be \[x=-4\pm2\sqrt{10} \over 6\]

  36. anonymous
    • one year ago
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    That's not an answer choice

  37. anonymous
    • one year ago
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    sorry... u r correct

  38. anonymous
    • one year ago
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    When you take the sqrt of 40 you find two radicals that multiply to give you 40 (sqrt 4 and sqrt 10) the sqrt of 4 is 2 but the 2 is attached to the sqrt of 10 so you cannot do -4=/- 2

  39. anonymous
    • one year ago
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    What are your answer choices

  40. anonymous
    • one year ago
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    I pointed out something I thought was wrong

  41. anonymous
    • one year ago
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    |dw:1434907656687:dw|

  42. anonymous
    • one year ago
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    |dw:1434907713281:dw|

  43. anonymous
    • one year ago
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    |dw:1434907746508:dw|

  44. anonymous
    • one year ago
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    I think what the answers did was simplify further. It makes sense in theory of what they did. Personally I don't simplify further because it doesn't give you as accurate a graph but if that is what the test or questions want then yes you are correct

  45. anonymous
    • one year ago
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    |dw:1434907790626:dw|

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spraguer (Moderator)
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