Which form most quickly reveals the vertex

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Nine more than four times a number is the same as one less than twice the number. find the number?

Place the following steps in order to complete the square and solve the quadratic equation,