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Answer:
C. x = -3
Step-by-step explanation:
The parabola has a vertical orientation (opens downward), so the axis of symmetry is a vertical line. It will have an equation of the form ...
x = constant
The vertex (high point) of the curve is on the axis of symmetry. Its x-coordinate is -3, so the equation of the axis of symmetry is ...
x = -3
