Answer:
The set of solution is {-9,-4}
Step-by-step explanation:
* We use this result: A.B=0 , that means A=0 or B=0.
* (x+9)(x+4)=0, then x+9=0 or x= - 9
Or x+4=0, x= - 4.
This equation has 2 solutions: - 9 and - 4.
Hope that useful for you.
