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

look at this graph: what is the minimum value of this function? submit
Answer
Explanation:
Step1: Identify vertex of parabola
The graph is a parabola opening upwards. Its vertex gives the minimum value.
Step2: Read vertex coordinates
The vertex of the parabola is at the point $(0,0)$. The $y$-coordinate of the vertex is the minimum value of the function.
Answer:
0