[A] Describe and correct the error in analyzing the graph of quadratic equation y = 4x2 + 24x - 7.
(a) The x-coordinate of the vertex is: x = [b/2a] = [24/(2(4))]=3.
(b) The y-intercept of the graph is the value of c, which is 7.
[B] What is the graph of a quadratic function a(n) called as and explain how to determine whether a quadratic function has a minimum value or a maximum value?