The polynomial function is f(x) = x3 + 4x2 + 3x. Use it to complete each statement. f(x) is on the intervals (–∞, –3) and (–1, 0).
f(x) is on the intervals (–∞, –2) and (–0.5, ∞).
f(x) is on the intervals (–3, –1) and (0, ∞).
f(x) is on the interval (–2, –0.5).

Options: Negative, Decreasing, Increasing, Positive