What is the equation of the quadratic function represented by the graph?
Attached Figure / Diagram
A
y = x2 + x - 2
B
y = -x2 - x + 2
C
y = x2 - x - 2
D
y = -x2 - x + 2
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
The required equation is y = x2 - x - 2
i.e. B where the graph touches the graph touches the x-axis y = 0
x2 - x - 2 = 0 = (x + 1)(x - 2) = 0
Hence roots of the equation are -1 and 2 as shown in the graph
Source: Myschool Past Questions Archive (Record #32874)