Question

Which of the following is the value of c for the best approximation for the quadratic function containing the points (5, 64), (7, 11), (9, -30), and (2, 4)?

A. -73
B. 50
C. -5
D. -17

Answer 1

I'd say A.
It looks like the peak is around 5.
In order, we have y-values:
4 64 11 -30
If the max is around x=5,
if we go 2 to the right we get 11 - a change of 53
If we go 3 to the left we get 4 - a change of 60
if we go 4 to the right we get -30 - a change of 94
if we go to the left we will be going a change of more than 94. -17 would only be a change of 81, so -73 is a better answer.