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Axis of symmetry problm

  1. Feb 15, 2015 #1
    1. The problem statement, all variables and given/known data
    mIK8i4d.png


    3. The attempt at a solution

    I would guess it is -b/2a but I have gotten this incorrect. Maybe I have to figure out what the parabola equation is and apply it into the axis of symmetry. Assuming that is correct how would I find that?

    Thanks
     
  2. jcsd
  3. Feb 15, 2015 #2

    Dick

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    You should be able to guess it like you guessed the other answers. Do you know what axis of symmetry means visually?
     
  4. Feb 15, 2015 #3
    Isn't it the line which divide the parabola into two even parts. So the line that goes directly down the middle.
     
  5. Feb 15, 2015 #4

    Dick

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    Right. What is that line?
     
  6. Feb 15, 2015 #5
    Look to be the y-axis itself?
     
  7. Feb 15, 2015 #6

    Dick

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    Right again. Now what's an EQUATION for that line?
     
  8. Feb 15, 2015 #7
    Oh I just looked up some information on this and it looks like x=0 would create a completely vertical line. Is this correct?
     
  9. Feb 15, 2015 #8

    Dick

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    Perfectly correct.
     
  10. Feb 15, 2015 #9
    Awesome! Thank you for your assistance!
     
  11. Feb 16, 2015 #10

    HallsofIvy

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    I would just like to add that your initial answer, "- 2a/b", makes no sense because there is no "a" and no "b" in the problem! I assume that was a general formula but you were not asked for a general formula, you were asked for an answer specific to this problem.
     
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