Question

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

Explanation:

Step1: Identify axis - symmetry property

For a parabola symmetric about a vertical line, the axis of symmetry passes through the vertex.

Step2: Locate the vertex

The vertex of the given parabola is at the point $(0,5)$. The vertical line passing through this point has the equation $x = 0$.

Answer:

$x = 0$