Answer:
-3 (x^2 + 2x + 3)
Step-by-step explanation:
First you find a number that is able to factor out of -3, 6, and 9
In this case it's 3
and since a is a negative, factor out -3
-3 (x^2 + 2x + 3)
That would be your final answer since you can't factor anything anymore.
Hope that helps!