Find the inflection points, if any, of the function. Otherwise, answer no solution. 
Definitions:
Quadrant
A quarter-section of a circle, grid, or any area divided into four distinct parts.
Public Housing Inventory
A list or database of public housing units available for occupancy, typically managed by a government or non-profit organization.
Central-City Areas
Regions located in the core of metropolitan areas, typically characterized by high population density and significant commercial, governmental, or cultural functions.
Upper-Class Individuals
People belonging to the highest socioeconomic group, typically characterized by wealth, power, and prestigious occupations.
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