Step-by-step explanation:

12/18
6/9
2/3
Simply in common factor you know and keep doing it
12/18
BCD:6
2/3
Answer to what? We need the question
Answer:
Vertex= (-5,-4)
Another point=(0, -129)
Step-by-step explanation:
The vertex is also the maximum, and the point is also the y-intercept.