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**Answer:**

- domain: (-∞, 3]
- range: (-∞, ∞)

**Step-by-step explanation:**

The focus is to the left of the vertex, so the parabola opens to the left. The domain is all values of x less than or equal to 3: (-∞, 3].

The vertical extent of the graph is *all real numbers*, so the range is (-∞, ∞).

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The graph shows the focus and directrix as well as the parabola.