The axis of symmetry for the downward-opening parabola with vertex (-3, 3) is x = -3, as it passes through the vertex, creating symmetry in the parabola.
The axis of symmetry for a parabola is a vertical line passing through its vertex, dividing the parabola into two symmetric halves. In the given graph, there's a downward-opening parabola with its peak at (-3, 3). The axis of symmetry will pass through the vertex.
Since the vertex is at (-3, 3), the axis of symmetry is a vertical line passing through x = -3. Therefore, the correct answer is:
Axis of Symmetry: x = -3.
This line divides the parabola into two symmetrical sections, and any point on one side of the parabola is mirrored on the other side with respect to this axis.
In summary, for the given parabola, the axis of symmetry is x = -3.