Answer:
[tex] - 4 {g}^{4} - 3 {g}^{3} + 4 {g}^{2} + 5g + 3[/tex]
Step-by-step explanation:
[tex]( {x}^{2} - 4 {{x} }^{4} + 5x + 9) + ( - 3 {x}^{3} + 3 {x}^{2} - 6) \\ = {x}^{2} - 4 {x}^{4} + 5x + 9 - 3 {x}^{3} + 3 {x}^{2} - 6 \\ = - 4 {x}^{4} - 3 {x}^{3} + {x}^{2} + 3 {x}^{2} + 5x - 6 + 9\\ = - 4 {x}^{4} - 3 {x}^{3} + 4 {x}^{2} + 5x + 3[/tex]
