Question

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

Explanation:

Step1: Identify parabola vertex x-coordinate

The vertex of the parabola is at $x=-5$, visible as the leftmost point of the curve.

Step2: Define axis of symmetry

For a parabola, the axis of symmetry is the vertical line through its vertex, given by $x = h$ where $h$ is the vertex x-coordinate.
<Expression>
$x = -5$
</Expression>

Answer:

$x = -5$