(5p^2 + 2p^4) + (4p^2 + 3p^3) - (9p^3 - 6p^4- 8p^2)

(5p^2 + 2p^4) + (4p^2 + 3p^3) - (9p^3 - 6p^4- 8p^2)

5p^2 + 2p^4 + 4p^2 + 3p^3 - 9p^3 + 6p^4+ 8p^2

5p^2+ 4p^2+ 8p^2 + 3p^3 - 9p^3 + 2p^4+ 6p^4

17p^2 - 6p^3 + 8p^4