P(c;d) = 2c^2 + 3c^2d + d - 5c^4 - 3c^2dP(c;d) = -5c^4 + 2c^2 - 3c^2d + 3c^2d + dP(c;d) = -5c^4 + 2c^2 + d
Therefore, the simplified expression for P(c;d) is P(c;d) = -5c^4 + 2c^2 + d
P(c;d) = 2c^2 + 3c^2d + d - 5c^4 - 3c^2d
P(c;d) = -5c^4 + 2c^2 - 3c^2d + 3c^2d + d
P(c;d) = -5c^4 + 2c^2 + d
Therefore, the simplified expression for P(c;d) is P(c;d) = -5c^4 + 2c^2 + d