Question

look at this graph:
what is the equation of the axis of symmetry?

Explanation:

Step1: Identify vertex x-coordinate

The vertex of the parabola is at $x=-3$, visible from the graph's lowest point.

Step2: State axis of symmetry

For a parabola, the axis of symmetry is the vertical line through its vertex, with equation $x = h$ where $h$ is the vertex's x-coordinate.

Answer:

$x=-3$