(2x^3 - 7x^2 + 16) + (6x^3 + 5x^2 - 1)

(2x^3 - 7x^2 + 16) + (6x^3 + 5x^2 - 1)

2x^3 - 7x^2 + 16 + 6x^3 + 5x^2 - 1

2x^3+ 6x^3 - 7x^2+ 5x^2 + 16- 1

8x^3-2x^2+15