determine the domain on which the following function is decreasing. answer attempt 1 out of 2

determine the domain on which the following function is decreasing. answer attempt 1 out of 2
Answer
Explanation:
Step1: Recall decreasing - function definition
A function is decreasing when as $x$ increases, $y$ decreases.
Step2: Analyze the graph
Looking at the given graph, the function starts to decrease from the vertex. The vertex of the parabola is at $x = 4$. As $x$ moves from $4$ to positive - infinity, the $y$ - values of the function are getting smaller.
Answer:
$(4,\infty)$