Determine the equation of the parabola whose graph is given below. Write your answer in General Form.

A parabola on a coordinate plane.
A coordinate plane has a horizontal x-axis labeled from negative 7 to 7 in increments of 1 and a vertical y-axis labeled from negative 7 to 7 in increments of 1. A parabola that opens downward has a vertex at left-parenthesis 1.5 comma 6.2 right-parenthesis and passes through the plotted points left-parenthesis 0 comma 4 right-parenthesis, left-parenthesis negative 1 comma 0 right-parenthesis, and left-parenthesis 4 comma 0 right-parenthesis.

Provide your answer below: