Afast food restaurant has determined that its price function is 3 − x / 20 000, where x represents the number of
hamburgers sold.
a. the cost of producing x hamburgers is determined by the expression 5000 + 0.56x. write an expression
representing the profit for selling x hamburgers.
b. complete the square for your expression in part (a) to determine the number of hamburgers that need to be
sold to maximize the profit, given this price function.