Complete the square for the expression x^2-12x

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

If you could answer these your a life saver

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.