Simplify: x2(x+3)−2x(x2−1)x^2(x + 3) - 2x(x^2 - 1)x2(x+3)−2x(x2−1).
−x3+3x2+2x-x^3 + 3x^2 + 2x−x3+3x2+2x
x3+3x2−2xx^3 + 3x^2 - 2xx3+3x2−2x
−x3+3x2−2x-x^3 + 3x^2 - 2x−x3+3x2−2x
3x2+2x3x^2 + 2x3x2+2x