Question

look at this graph:
what is the minimum value of this function?

Explanation:

Step1: Identify vertex of parabola

The graph is a parabola opening upward, so its minimum value is at the vertex. The vertex is at the point $(0, -1)$.

Step2: Extract y-value of vertex

The minimum value of the function is the y-coordinate of the vertex.

Answer:

$-1$