Simplify the expression: (3x2+5x−2)+(x2−2x+4)(3x^2 + 5x - 2) + (x^2 - 2x + 4)(3x2+5x−2)+(x2−2x+4).
4x2+3x+24x^2 + 3x + 24x2+3x+2
4x2+7x+24x^2 + 7x + 24x2+7x+2
3x2+3x+23x^2 + 3x + 23x2+3x+2
4x2+3x−64x^2 + 3x - 64x2+3x−6