Answer:
-1, 1
Negative one and positive one total up with a sum of 0.
-2 + 0 is -2.
0 and 1 is 1.
0 and -1 is -1.
So, it has to be -1 and 1.
To find the range we need to find the vertex of the parabola which is at (-b/2a , y)
-b/2a would be 2/2 = 1 ... so find the y value at x = 1
12 - 2(1) - 15 = 1-17 = -16
So the vertex is at (1,-16)
Since the parabola opens upward from that point the minimum value of the range is y = -16
The range would include the point -16 so it is actually
R = [-16,infinity)
