Find the equation of the polynomial function graphed below. The graph of an s-shaped curve with x-intercepts x = -2, 1, 4. f(x) = x3 + 3x2 − 6x − 8 f(x) = x3 − 3x2 − 6x + 8 f(x) = 8x3 + 24x2 − 48x − 64 f(x) = 8x3 − 24x2 − 48x + 64