# Axis of symmetry problm

Tags:
1. Feb 15, 2015

### Niaboc67

1. The problem statement, all variables and given/known data

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. Feb 15, 2015

### Dick

You should be able to guess it like you guessed the other answers. Do you know what axis of symmetry means visually?

3. Feb 15, 2015

### Niaboc67

Isn't it the line which divide the parabola into two even parts. So the line that goes directly down the middle.

4. Feb 15, 2015

### Dick

Right. What is that line?

5. Feb 15, 2015

### Niaboc67

Look to be the y-axis itself?

6. Feb 15, 2015

### Dick

Right again. Now what's an EQUATION for that line?

7. Feb 15, 2015

### Niaboc67

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. Feb 15, 2015

### Dick

Perfectly correct.

9. Feb 15, 2015

### Niaboc67

Awesome! Thank you for your assistance!

10. Feb 16, 2015

### HallsofIvy

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.