Simplify: 2x2+3x−x2+5x−12x^2 + 3x - x^2 + 5x - 12x2+3x−x2+5x−1.
x2+8x−1x^2 + 8x - 1x2+8x−1
x2+8x+1x^2 + 8x + 1x2+8x+1
3x2+8x−13x^2 + 8x - 13x2+8x−1
x2−8x−1x^2 - 8x - 1x2−8x−1