Question

I need help with this question

Answer 1

F(x)= x^3 + 4x^2 - 4x -16

= x^2 (x+4)-4(x+4)
=(x^2 -4)  (x+4)
x=2, x=-4
so the point should be (2,0), (-4,0) and 16 to the down.
Thus, number 1 is the correct answer.