Question

paso a paso porfa :(​

Answer 1

Respuesta:

$a + b = - 3 {x}^{5} + 2 {x}^{4} - 7 {x }^{2} + 8x - 9 + 5 {x}^{4} - 8 {x}^{3} + 10 {x}^{2} - 3x + 4$

$a + b = - 3 {x}^{5} + 7 {x}^{4} + 3 {x}^{2} + 5x - 5$