Answer:
The function that represents the graph is
.
Step-by-step explanation:
The graphic represents a vertical parabola, whose standard equation is:

Where:
- Independent variable, dimensionless.
- Depedent variable, dimensionless.
- Horizontal component of the vertex, dimensionless.
- Vertical component of the vertex, dimensionless.
- Vertex constant, dimensionless. Where
when vertex is an absolute minimum, otherwise it is an absolute maximum.
According to the figure, vertex is located in
. Now we determine the vertex constant by using the following values in the standard equation:
,
,
, 




The function that represents the graph is
.