Mark M. answered 10/23/23
Retired college math professor. Extensive tutoring experience.
The graph of y = a(x - h)2 is a parabola.
Since the y-coordinates of the two given points are the same, the x-coordinate, h ,of the vertex lies halfway between the x-coordinates of those two points.
So, h = -2.
Therefore, y = a(x + 2)2
Plug in either of the given points and solve for a.