Question 1032582
a compresses the graph as it becomes larger. If positive, a makes it U shaped, if negative the opposite.
the vertex is (-h,k)
{{{graph(300,200,-10,10,-10,10,(x-3)^2+3,-(x-3)^2+3, (x+2)^2-4)}}}
The ones on the right have vertex (3,3), with equation (x-3)^2+3 and -(x-3)^2-3.  The other one has equation (x+2)^2-4, so its vertex is (-2,-4) and is U shaped.