vera_ewing
  • vera_ewing
Pre-calculus question
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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vera_ewing
  • vera_ewing
vera_ewing
  • vera_ewing
@Directrix Help please!
Directrix
  • Directrix
Sorry, my computer crashed, and I had to find my way back here. Look at the graph of y = x^2 - 7
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Directrix
  • Directrix
That will give you some idea. Algebraically, y = x^2 - 7 can be written as y = 1*x^2 + 0x -7. The x coordinate of the vertex will give the line of symmetry using the formula, x = -b/(2a) where b = 0 and a = 2*1. So, x = 0.
Directrix
  • Directrix
Is x = 0 the y-axis
vera_ewing
  • vera_ewing
So how do we know which is symmetric?
Directrix
  • Directrix
The parabola y = 1*x^2 + 0x -7 is symmetric about the line x = 0. Which option is that?
vera_ewing
  • vera_ewing
C. the x axis
Directrix
  • Directrix
No. The x-axis is horizontal.
vera_ewing
  • vera_ewing
Oh so they y axis since it's vertical?
Directrix
  • Directrix
Look at this picture.
Directrix
  • Directrix
The y-axis because it has equation x = 0. Note on the picture that you could fold the parabola about the y-axis and the two parts would coincide.
vera_ewing
  • vera_ewing
Ok thank you SO much!!
Directrix
  • Directrix
You are welcome.

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