graph the parabola, plot the vertex and four additional points, two on each side of the vertex. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! y=-(1/2)x^2
vertex has x value of -b/2a. But there is no b, so vertex has x value of 0, and y value of 0. The origin.
when x=1 or -1, y=-1/2
when x=2 or -2, y=-2