Factor the expression as the sum or difference of two cubes. 
Definitions:
Quantity Demanded
The entire quantity of a product or service that buyers are ready and capable of buying at a certain price point.
Price
The amount of money required to purchase a good or service, determined by various factors including supply, demand, production cost, and competition.
Total Revenue
The total amount of money a firm receives from sales of its goods or services.
Price Elasticity
A measure of how the quantity demanded of a good or service changes in response to a change in its price.
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