Question

In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis?
(-2, 2) È (4, ∞)
(-4, -2) È (2, ∞)
(-∞, -2) È (-2, 9)
(-4, -2) È (2, 4)

Answer 1

please help

Answer 2

I believe its d

Answer 3

What does "above x axis" mean?

Answer 4

I might be wrong tho its definetly not a infinite since your graph probably ends on line segment, or does it go on forever?

Answer 5

One more try: @traplord What does "above x-axis" mean???