00:01
So in this problem, we know that the parabola opens to the left, and our vertex is at 2 -9 -4.
00:08
And we're trying to write the equation of the parabola that passes through the point, negative 1, 3.
00:16
So if this opens to the left, we're going to get a parabola that looks something like this.
00:21
And again, i don't really need the picture, but i'm just doing that for my own good.
00:25
The important part here is that the vertex here is at 2 -9 -4.
00:31
And because the parabola opens left and right, i know that the y part of the equation will be squared and the x part will not be.
00:40
Well, the x part will be at negative 2 for my vertex.
00:44
Positive 2 becomes negative 2 in the parentheses...