Simplify (9-3x^2)+(-8x^2+4x+5)

$(9 - 3 x^{2}) + (- 8 x^{2} + 4 x + 5)$

Simplify the expression.

Remove parentheses.

$9 - 3 x^{2} - 8 x^{2} + 4 x + 5$

Add $9$ and $5$ .

$- 3 x^{2} - 8 x^{2} + 4 x + 14$

Subtract $8 x^{2}$ from $- 3 x^{2}$ .

$- 11 x^{2} + 4 x + 14$