Chapter 9 - Quadratic Functions and Equations - 9-1 Quadratic Graphs and Their Properties - Practice and Problem-Solving Exercises - Page 550: 32

Domain: All real numbers Range: $y\geq12$

For a parabola, the domain is almost always all real numbers. Here, the y value of the vertex is 12. Because of the 2/3 in front of the $x^2$, the vertex is the minimum value. Thus, the range includes all values greater than or equal to the y value of the vertex.