9 - 6a - 24a^2
To simplify the expression 9 - 6a - 24a^2, combine like terms.
-24a^2 is the only term with an exponent, so we cannot combine it with the other terms.
Therefore, the simplified expression is 9 - 6a - 24a^2.
-24a^2 is the only term with an exponent, so we cannot combine it with the other terms.
Therefore, the simplified expression is 9 - 6a - 24a^2.