Use the second derivative test to find the relative extremas of f(x)= -4 
and where they occur.If the relative extremas can not be determined by the second derivative test,state so.
Definitions:
Feedback Input
In control systems, this is an input derived from the output of the system itself, used to adjust or control the system.
Desired Operating Point
The specific value or condition that a system or process is intended to achieve and maintain for optimal performance.
Communications Links
Physical or wireless connections between devices that allow for data exchange.
PLC Systems
Systems that use Programmable Logic Controllers for automation of industrial electromechanical processes.
Q37: Determine the equations of the vertical asymptotes
Q65: The base of a triangle is decreasing
Q70: The rate of seepage from a toxic
Q90: An oil company estimates that for the
Q95: Use Newton's method to approximate the root
Q109: Find the average value of the function
Q127: The demand function for a manufacturer's product
Q140: The amount A of glucose present in
Q186: Find all values of x for which
Q221: If the revenue for a certain company