# IIIQuadraticFunctions - Dr. Raja Latif. Math 131043.Sec:...

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4 . 3 : Quadratic Equations Recommended Examples : 5 pp : 138 139 , Recommended Pr actice Prob # 3 Page #139 HomeWork Problems .: 29,31,33,39,41 Example . HB69E4 . 10 . A manufacturer can produce radio at a cost of \$2 each . The radio have been selling for \$5 each , and at this price , consumers have been buying 4000 radios a month . The manufacturer is planning to raise the price of the radios and estimate that for each \$1 increase in the price , 400 fewer radios will be sold each month . Express the manufacturer s monthly profit as a function of the selling price . at what price should the radios be sold to maximize profit ? Solution . Let x denote the price at which the radio will be sold and P x the corresponding profit . Number of radios sold 4000 400 number of \$1 increases The number of \$1 increases in the price is x 5, the difference between the new and

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## This note was uploaded on 12/17/2009 for the course MATH MATH131 taught by Professor Dr.rajalatif during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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IIIQuadraticFunctions - Dr. Raja Latif. Math 131043.Sec:...

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