1 answer
(click or scroll down)
a) The second differences are positive, meaning that the graph is concave up. This means that the y-value of the vertex is a minimum value, since the graph opens upward.
b) Since the vertex is a minimum value, the y-value of the vertex must be positive, as it is the lowest point on the graph.
c) The x-coordinate of the vertex can be found by taking the average of the x-intercepts: (3 - 4) / 2 = -0.5