Question

What is the equation of the line of symmetry for the graph of y = 3(x + 2)2 – 4?

Answer 1

The line of symmetry is the line that goes through the vertex of this parabola. Do you know how to find the vertex?

Answer 2

no

Answer 3

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).

Answer 4

Ohhh! Okay got it!

Answer 5

So, what's the vertex?

Answer 6

And remember that once you have the vertex, you still need to find the line of symmetry.

Answer 7

-2?

Answer 8

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?

Answer 9

Ohh, thank you so much. You helped a ton!

Answer 10

no problem :)