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Unformatted text preview: B U Department of Mathematics Math 202 Differential Equations Summer 2000 First Midterm This archive is a property of Bo˘gazi¸ ci University Mathematics Department. The purpose of this archive is to organise and centralise the distribution of the exam questions and their solutions. This archive is a non-profit service and it must remain so. Do not let anyone sell and do not buy this archive, or any portion of it. Reproduction or distribution of this archive, or any portion of it, without non-profit purpose may result in severe civil and criminal penalties. 1. (a) Solve the initial value problem: y = 2(2 t- y ) , y (0) = 1 Solution: Equation is linear: y + 2 y = 4 t ; ( e 2 t y ) = 4 te 2 t y ( t ) = 2 t- 1 + ce- 2 t is the general solution. y (0) =- 1 + c = 1 ⇒ c = 2 y ( t ) = 2 t- 1 + 2 e- 2 t is the unique solution of the initial value problem. (b) Solve: 2 tyy = 9 t 2 + 3 y 2 Solution: Equation is homogeneous: Let y = tv ( t ) ⇒ 2 tvv = 9 + v 2 is a separable equation....
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This note was uploaded on 11/16/2011 for the course MATH 251 taught by Professor Gurel during the Winter '11 term at Boğaziçi University.
- Winter '11