Very good!
Specially if the -225(-25) were written not too close to the -25(x^2 -30x +225).
As posted, the two terms appeared multiplied to each other.
Items are sold for $45 each. 195 people are willing to buy them. For every $5 increase in price, 5 fewer people are willing to buy the item. Determine the maximum revenue and the number of price increases.
Let x be the number of increments.
Let y be the total cost.
Where total revenue = $14400
Where total numer of increases = 15