Answer:
The x-coordinate of the turning points is -2.5
Step-by-step explanation:
-14 = 0 + 0 + c
c = -14
0 = 2² + 2(b) -14
2b -14 + 4 = 0
2b = 10
b = 5
Turning point:
y = x² + 5x - 14
dy/dx = 2x + 5 = 0
2x + 5 = 0
x = -5/2 = -2.5
