(−2x + 9) + (x2 + x − 9)

Answer 1

(-2X+9) + (X^2+X-9).

X^2 - 2X + X - 9 - 9,
X^2 - X = X(X-1).

Answer 2

Correction:

X^2 - 2X +X + 9- 9,