Answer:
[tex]5 {x}^{2} + 2x - 1 + 4 {x}^{2} -x - 9 \\ 5 {x}^{2} + 4 {x}^{2} + 2x - x - 1 - 9 \\ = 9 {x}^{2} + x - 10[/tex]
