Axis of symmetry problm

  • #1
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Homework Statement


mIK8i4d.png



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[/B]
 

Answers and Replies

  • #2
Dick
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Homework Statement


mIK8i4d.png



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[/B]

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

Right. What is that line?
 
  • #5
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Look to be the y-axis itself?
 
  • #6
Dick
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Look to be the y-axis itself?

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

Perfectly correct.
 
  • #9
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Awesome! Thank you for your assistance!
 
  • #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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