Solve the initial value problem

mnamnahj

mnamnahj

Answered question

2022-04-09

Solve the initial value problem

Answer & Explanation

Vasquez

Vasquez

Expert2023-04-27Added 669 answers

y2y+y=δ(t1),y(0)=2,y(0)=3
The general solution of the homogeneous equation is:
yh(t)=c1et+c2tet
To find a particular solution of the inhomogeneous equation, we assume a function that satisfies the inhomogeneous term. In this case, we need to find a function that is zero for all t1 and infinity at t=1 such that the area under the function is equal to one. A function that satisfies these conditions is:
yp(t)={0,t<1a,t>1
where a is a constant to be determined.
Using the definition of the Dirac delta function, we have:
δ(t1)dt=1
δ(t1)f(t)dt=f(1)
for any function f(t) that is continuous at t=1.
Therefore, we have:
δ(t1)yp(t)dt=yp(1)=a
Since the inhomogeneous equation is linear, we can superpose the homogeneous and particular solutions to obtain the general solution:
y(t)=yh(t)+yp(t)=c1et+c2tet+au(t1)
where u(t1) is the unit step function, which is zero for all t<1 and one for all t>1.
Using the initial conditions y(0)=2 and y(0)=3, we can determine the values of c1, c2, and a as follows:
c1+a=2
c1+c2=3
Differentiating y(t) with respect to t and evaluating at t=0 gives:
y(0)=c1+c2+aδ(01)=3
Simplifying, we get:
c1=1,c2=2,a=1
Therefore, the solution to the initial value problem is:
y(t)=et+2tet+u(t1)

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