11. A store sells about 40 video game systems each month when it charges $200 per system. For each $10 increase in price, about 1 less system per month is sold. The store's revenue can be modeled by y = (200 + 10x)(40 – x). Help the store owner to convert this equation to vertex form to find the ideal price of a video game system to maximize their revenue.

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A: Quadratic Surface:

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