The image of the parabolic Lens is traced onto a graph. The function f(x) = 1/4*(x+8)(x-4) represents the image. At which points does the image cross the x-axis A. (-8, 0) and (4,0)
B. (8,0) and (-4,0)
C. (2,0) and (-1,0)
D. (-2,0) and (1,0)

In a quadratic function, the variable c is called the y-intercept. It is the value of y when x is equal to zero. Hence, when variable c is increased by one, the form of the graph of the quadratic function does not change but only move up from the origin.