The image of a parabolic lens is traced onto a graph. the function f(x) = (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)

We know that the function crosses the x-axis when y=0. What numbers can we plug into the function for x that will make the entire function = 0? 

If x = -8 or 4 then the function is = 0.

Since coordinates are displayed as (x, y), A. (–8, 0) and (4, 0) is your answer because x = -8 and 4 in these coordinates.