Final answer:
The function g(x) defined by the equation g(x) = (x + k)³ is a cubic function and the equation defines a cubic curve.
Step-by-step explanation:
The function g(x) defined by the equation g(x) = (x + k)³ is a cubic function, which means it is a function of the form y = ax³ + bx² + cx + d.
In this case, the function has one term with a degree of 3, which makes it cubic. The equation defines a cubic curve on a graph.