Answer:
(2, -9); minimum
Step-by-step explanation:
The vertex is the point that either has the largest y value (maximum) or it has the smallest y value (minimum). It is also the point on the graph where if it's a maximum, all the points to the left and right of it are less than it and if it's a minimum, all the points to the left and right of it are more than it.
Looking at the table, we see that the smallest y value is -9. The values beside it are -5 and -8, where are both greater than -9. So, this is a very potential candidate for minimum.
The largest y value is 7. We can't see all the values beside it, but we can guess from the trend, that the y values on one side will be more. So, it can't be a maximum.
Thus, the vertex is at the minimum (2, -9).
Hope this helps!
