Question

(5x2 + 2x - 1) + (4x2 - x -9)

Answer 1

Answer:

$5 {x}^{2} + 2x - 1 + 4 {x}^{2} -x - 9 \\ 5 {x}^{2} + 4 {x}^{2} + 2x - x - 1 - 9 \\ = 9 {x}^{2} + x - 10$