Determine if a quadratic has a max or min as it's vertex

The video tutorial explains how to determine whether a vertex is a maximum or minimum point based on the value of 'a' in a quadratic equation. If 'a' is less than zero, the vertex is a maximum point; if 'a' is greater than zero, the vertex is a minimum point. The tutorial walks through the process of applying this test to a given vertex and concludes with a recap of the key points.

What conclusion can be drawn if 'a' is greater than zero?

What would happen to the vertex if 'a' were to change from positive to negative?