need positive negative and imaginary

Won't factor. My graphing calculator shows a curve from lower left, making an s-turn across the x and then y axis, and exiting to the upper right. Key points include:

x-intercept: -3.91964, 0.0

y-intercept: 0.0,3.0

Max inflection vertex: -2.72, +6.27

Min inflection vertex: -0.613, +1.58