An aerial view of a curved section of road is modeled by the graph.


Part A
Identity the vertex and endpoints of the curve to help write the quadratic function that models the curve of the road.

Enter the correct expression in the box to complete the quadratic function.

f(x) = ______

(Available Hint: The quadratic function should be written in the form f(x) = a(x-h)^2+k, where a represents the vertical stretch or compression, h is the x-value of the vertex, and k is the y-value of the vertex.