What is the vertex of the graph of y = x^2 - 19x + 74?

vertex=(9.5,-16.25)

I used -b/(2a)=19/2=9.5 to solve for the x coordinate. Then substituted to find the y-coordinate --> y=9.5^2-19(9.5)+74, y=-16.25

You can also solve it by completing the square.