The process by which managers at all levels in the firm gain information about the performance of tasks within the firm and judge that performance against pre-established criteria is:

Performance management

Explanation:

Performance management system is a system put in place in an organization to evaluate the performance of employees. It aligns the company's overall goals to available resources and work out performance towards realization of the goals and also develop employees' skills towards achieving the goals and then constant evaluation of performance .

As managers require adequate relevant information about performance of tasks within the system in order to evaluate performance against the set criteria , an effective performance management  makes it possible for him to access

Step-by-step explanation:

To complete the square you divide the linear coefficient of x by 2, square it, and add that to both sides. In this case the coefficient is 3 so

(3/2)^2=9/4 or 2.25

So you would add 9/4 or 2.25 to both sides.