Is the vertex always negative?

Could you please clarify for me, is the vertex of a quadratic equation always negative? I understand that the vertex represents the minimum or maximum point of the parabola, but I'm unsure if it's always positioned below the x-axis or if it can also be above it. Could you provide an example to illustrate your point? Additionally, how does the coefficient of the x-squared term affect the position of the vertex? Thank you for your assistance in clarifying this concept.