Hello!
As we can see this graph is a parabola, so we can say that it is a quadratic function (because intercepts the x-axis twice).
Now, let's remember some important concepts:
• Domain,: The domain is related to the x values (horizontal line).
,• Range,: The range is related to the y values (vertical line).
Knowing it, let's analyze the graph.
Ops, we have a problem! Look in the graph that the point (4, 6) has an open circle on it. It means that this value of the domain isn't a part of the function.
Remember: we are talking about domains, so we will pay attention to the horizontal line.
According to the exercise, the domain is all real numbers, except when x = 4.
Alternative C.