Hi,

 y = -2x^2

I. A parabola opening Downward

II. V(0,0) 

III.  Line of symmetry is the y=axis.

IV. Pt(1,-2) on the curve



the vertex form of a Parabola opening up(a>0) or down(a<0),  

where(h,k) is the vertex  and  x = h  is the Line of Symmetry

 

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