Question

how to add polynomial (x cube - 2 x square - 9) and (5 x cube + 2 X + 9)

Answer 1

$x {}^{3} - 2x {}^{2} - 9 + 5x {}^{3} + 2x + 9$
$x {}^{3} + 5x {}^{3} - 2x {}^{2} + 2x - 9 + 9$
$6x {}^{3} - 2x {}^{2} + 2x$