Use the graph of the function f to find the value(s) of x at which f is not differentiable. 
Definitions:
Business Responsibilities
The obligations and duties of businesses to act ethically, with accountability towards society, the environment, and their stakeholders.
American Market Economy
An economic system where decisions regarding investment, production, and distribution are based on supply and demand, with minimal government intervention.
Government Planning
The process by which a government sets priorities, establishes goals, and devises strategies to achieve economic, social, and political objectives.
Voluntary Actions
Behaviors or actions undertaken by choice or will without external coercion.
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