Question

on what interval is the graph decreasing?

Explanation:

Step1: Analyze the parabola's properties

The graph is a parabola opening upwards.

Step2: Determine the decreasing interval

For a parabola opening upwards, it is decreasing to the left of the vertex. The vertex \(x\) - coordinate is \(3\). So the decreasing interval is \(-\infty < x < 3\).

Answer:

$\infty < x < 3$