Based on the graph shown above, an equation for the quadratic function is
.
In Mathematics and Euclidean Geometry, the vertex form of a quadratic function is represented by the following mathematical equation:

Where:
- h and k represents the vertex of the graph.
- a represents the leading coefficient.
Based on the information provided above, we can determine the value of a by using the vertex (2, -1) and point (4, 3) as follows:

3 = 4a - 1
4a = 3 + 1
a = 4/4
a= 1
Therefore, the required quadratic function that represents g(x) can be written as follows;
