anonymous
  • anonymous
What is the equation of the line of symmetry for the graph of y = 3(x + 2)2 – 4?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
The line of symmetry is the line that goes through the vertex of this parabola. Do you know how to find the vertex?
anonymous
  • anonymous
no
anonymous
  • anonymous
Your equation is already given in what is called "vertex form". Given:\[y=a(x-h)^2+k\]The vertex is the point (h,k).

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anonymous
  • anonymous
Ohhh! Okay got it!
anonymous
  • anonymous
So, what's the vertex?
anonymous
  • anonymous
And remember that once you have the vertex, you still need to find the line of symmetry.
anonymous
  • anonymous
-2?
anonymous
  • anonymous
x=-2 is correct. Saying "-2" doesn't tell us anything. Make sure you write x=-2. This is a vertical line through the point (-2,-4). It cuts the parabola into symmetry halves. It is the line of symmetry for this parabola. Make sense?
anonymous
  • anonymous
Ohh, thank you so much. You helped a ton!
anonymous
  • anonymous
no problem :)

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