# Assignment 7 - km/h Explain why the police have a right to...

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MATH 137 Assignment 7, Part 2 Due: 11 am, Friday, November 12 Your assignment consists of two separate parts. Part 1 is available online at http://mapleta.uwaterloo.ca and is due at 4 pm on Thursday November 11. Part 2 consists of the problems below. Place part 2 of your assignment in the correct drop box outside MC 4066, corresponding to the class section in which you are registered. Hand in your solutions to the following 5 problems. 1. For what values of the real numbers a and b does the function f ( x ) = ax e bx 2 have the absolute maximum value f (2) = 1 ? 2. You are driving on a straight highway on which the speed limit is 100 km/h. At 8:00 am, a police car clocks your velocity at 95 km/h. At 8:04 am, a second police car posted 9 km down the road clocks your velocity at 100

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Unformatted text preview: km/h. Explain why the police have a right to charge you with a speeding violation. 3. Use the Mean Value Theorem to prove the inequality | cos a-cos b | ≤ | a-b | for all real numbers a and b. (Hint: See Exercise #29 in Section 4.2 of the textbook.) 4. Prove the following statements: (a) The equation x 3 + 4 x-1 = 0 has exactly one real root. (b) If b 2-3 ac < and a 6 = 0 , then the equation ax 3 + bx 2 + cx + d = 0 has exactly one real root. (Hint: We already know that every cubic polynomial has at least one real root from Assignment 4, Part 2.) 1 5. Show that e x > 1 + x + x 2 2 for all x > . (Hint: Let f ( x ) = e x-(1 + x + x 2 / 2) . What is f (0) ? What can you say about the sign of f ( x ) ?) 2...
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## This note was uploaded on 12/18/2010 for the course ECONOMICS 120 taught by Professor Mesta during the Spring '10 term at Wilfred Laurier University .

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Assignment 7 - km/h Explain why the police have a right to...

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