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

Explanation:

Step1: Identify vertex x - coordinate

For a parabola, the axis of symmetry passes through the vertex. The x - coordinate of the vertex gives the equation of the axis of symmetry.

Step2: Locate vertex on graph

By observing the graph, the vertex of the parabola is at the point where the parabola changes direction. The x - coordinate of the vertex of this parabola is $x=- 3$.

Answer:

$x = - 3$