Question

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

Explanation:

Step1: Identify parabola symmetry axis

The axis of symmetry of a vertical parabola is a vertical line that divides the parabola into two mirror halves, passing through its vertex.

Step2: Locate vertex on graph

The vertex of the parabola is at $(0, -7)$, so the vertical line through this point is $x=0$.

Answer:

$x=0$