2x^3 - x^2 - 5x - 2 = 2x^3 + 0x^2 + 0x - x^2 - 5x - 2= 2x^3 + 0x^2 - x^2 - 5x - 2= 2x^3 - x^2 - 5x - 2
2x^3 - x^2 - 5x - 2 = 2x^3 + 0x^2 + 0x - x^2 - 5x - 2
= 2x^3 + 0x^2 - x^2 - 5x - 2
= 2x^3 - x^2 - 5x - 2