Factor the perfect square trinomial. 
Definitions:
Average Revenue
The amount of revenue a company receives per unit of output sold, calculated by dividing total revenue by the quantity of goods or services sold.
Marginal Revenue
Additional income received from selling one more unit of a product or service.
Total Revenue
The total amount of money a firm receives from its sales of goods or services, calculated by multiplying the price per unit by the number of units sold.
Average Revenue
The amount of money a company makes for each unit of product sold, which is found by dividing the overall revenue by the number of units sold.
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