Problem: "The graph of a quadratic function has a vertex at (-3,7) and a Y-intercept of 18. Name any other point on the parabola."

Y-7= a(x+3)^2 is the only thing that comes to mind, and It's not really helping me solve this question...

Identical problem: "Find a particuar equation of the quadratic function that passes through a vertex of (5,-1) and the point (8,-28)."

Any help would be much appreciated.