Question 1008813
Vertex form means Standard Form.


{{{y=a(x-h)^2+k}}}  has vertex  (h,k).
You are given  the vertex  h=7 and k=11.  You are given another point on your parabola but do not yet know "a".


METHOD can be, solve for a, and then substitute for h and k, and the coordinates of the point  (3,5) for (x,y), and evaluate "a".