Which expression can be used to find the sum of the polynomials? open paren 9 minus 3 x squared close paren plus open paren negative 8 x squared plus 4 x plus 5 close paren

Group the like terms in (9 − 3x²) + (−8x² + 4x + 5). The squared terms are −3x² and −8x², the x-term is 4x, and the constants are 9 and 5. So the expression is [(-3x²) + (-8x²)] + 4x + [9 + 5], which is choice C.

AI-written and checked against the verified answer.