Find an equation for the parabola shown in the figure. 
Definitions:
Marginal Utility
The extra gratification or benefit received from using an additional unit of a product or service.
Video Game Rental
A service that allows consumers to borrow video games for a limited time period before returning them.
Perfectly Competitive Market
An economic scenario where numerous producers and consumers in the market have no ability to influence prices or product quality, allowing for free and fair competition.
Marginal Utility
The additional satisfaction or utility that a consumer gains from consuming one more unit of a good or service.
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