Find all x-values for which the slope of the tangent is 0 for the given function. 
Definitions:
Physical Capital
Tangible assets used in the production of goods and services, such as machinery, buildings, and equipment.
Future Goods
Products or services that are not yet manufactured or provided but are planned for future sale.
Inputs
Resources such as labor, materials, and capital that are used in the production process to create goods or services.
Market Rate
The prevailing price determined by supply and demand in the open market for services or commodities.
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