Add: (3x3−2x+1)+(x3+5x−4)(3x^3 - 2x + 1) + (x^3 + 5x - 4)(3x3−2x+1)+(x3+5x−4).
4x3+3x−34x^3 + 3x - 34x3+3x−3
4x3+3x+54x^3 + 3x + 54x3+3x+5
4x3−3x+34x^3 - 3x + 34x3−3x+3
3x3+5x−33x^3 + 5x - 33x3+5x−3