12 3 4 5 6 7 8 9 10 time remaining 59: 13 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? (–8, 0) and (4, 0) (8, 0) and (–4, 0) (2, 0) and (–1, 0) (–2, 0) and (1, 0) mark this and return save and exit next submit

If you are given an image of a parabolic lens, then apply the formula (y - h)² = 4a(x - k) or (x - h)² = 4a(y - k). You are given the function f(x) = (x + 8)(x – 4) and you are asked to find which points does the image cross the x-axis. To solve this, yo need to expand the given equation. 

f(x) = (x + 8)(x – 4)
y = (x + 8)(x – 4)
y = x² - 4x + 8x - 36
y = x² + 4x - 32
From the equation that we derived, we can see that the parabola is facing rightward the x - axis. Among the choices, (–8, 0) and (4, 0) crosses the x-axis.

Def is a scalene triangle