The point (4,-2) is the vertex of the graph of a quadratic function. The points (8,6) and (2,0) also fall on the graph of the function. Complete the graph of this quadratic function by first finding two additional points on the graph. Part A: What is the y-intercept of the graph?

Part B: What are the x-intercepts?

Part C: Find the interval on which the rate of change is always positive.

Part D: What is a sign of the leading coefficient for this quadratic function? How do you know?