y" + 2y' + 5y = 13e²t (a) Find a particular solution of this equation. (b) Solve the initial value problem of this equation with initial conditions y(0) = 1, y'(0) = 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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y" + 2y' + 5y = 13e²t
(a)
Find a particular solution of this equation.
(b)
Solve the initial value problem of this equation with initial conditions y(0) = 1,
y'(0) = 0.
Transcribed Image Text:y" + 2y' + 5y = 13e²t (a) Find a particular solution of this equation. (b) Solve the initial value problem of this equation with initial conditions y(0) = 1, y'(0) = 0.
Expert Solution
Step 1 a)

The given differential equation is

                                                 y''+2y'+5y=13e2t .....................................(1)

To find C.F :

        The auxiliary equation of (1) is  m2+2m+5=0

                                                 m=-24-202

                                                 m=-2-162

                                                  m=-24-12

                                                  m=-12i

Therefore the complementary function of (1) is

                                                yC.F=e-t{C1cos(2t)+C2sin(2t)}

 where C1 and C2 are arbitary constant .

To find P.I :

   Let the trial particular integral solution be 

                                                                     yP.I=Ae2t ....................................(2)

   Where A is a constant.

    Then               yP.I'=2Ae2t

                            yP.I''=4Ae2t

Now we put the value of yP.I , yP.I' , yP.I'' in (1) we get the value of A.

                                                             4Ae2t+4Ae2t+5Ae2t=13e2t

                                                          13Ae2t=13e2t

                                                          A=1

 Now we put the value of A in (2) we get

                                               yP.I=e2t

Hence the particular integral is yP.I=e2t

       Therefore the general solution is y=yC.F+yP.I

                                                          y=e-t{C1cos(2t)+C2sin(2t)}+e2t  ...................(3)

Where  C1 and C2 are arbitary constant .

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