Find the local maximum, and minimum value and saddle points of the function. 
Definitions:
Experimental Factor
An independent variable manipulated by the researcher in an experiment to determine its effect on an outcome.
Independent Variable
The variable in an experiment that is manipulated or changed to observe its effect on the dependent variable.
Dependent Variable
The variable in a study that is measured to see if it is affected by changes in another variable (the independent variable).
Interpersonal Attraction
A force that draws people together, often leading to friendships or romantic relationships, influenced by factors like physical attractiveness, similarities, social status, and familiarity.
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