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Determine the Laplace transforms of the initial value problem (IVP)y′′−3y′+2y=4δ(t−3),y(0)=0,y′(0)=0𝑦″−3𝑦′+2𝑦=4𝛿(𝑡−3),𝑦(0)=0,𝑦′(0)=0and obtain an expression for Y(s)=L(y)(t)𝑌(𝑠)=𝐿(𝑦)(𝑡). Do not find the inverse Laplace transform of the resulting equation.

Question

Determine the Laplace transforms of the initial value problem (IVP)y′′−3y′+2y=4δ(t−3),y(0)=0,y′(0)=0𝑦″−3𝑦′+2𝑦=4𝛿(𝑡−3),𝑦(0)=0,𝑦′(0)=0and obtain an expression for Y(s)=L(y)(t)𝑌(𝑠)=𝐿(𝑦)(𝑡). Do not find the inverse Laplace transform of the resulting equation.

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Solution

The Laplace transform of the given initial value problem can be found by taking the Laplace transform of each term separately.

The Laplace transform of y'' is s^2Y(s) - sy(0) - y'(0), which simplifies to s^2Y(s) since y(0) = y'(0) = 0.

The Laplace transform of -3y' is -3sY(s) + 3y(0), which simplifies to -3sY(s) since y(0) = 0.

The Laplace transform of 2y is 2Y(s).

The Laplace transform of 4δ(t-3) is 4e^(-3s) because the Laplace transform of δ(t-a) is e^(-as).

So, the Laplace transform of the given differential equation is s^2Y(s) - 3sY(s) + 2Y(s) = 4e^(-3s).

This simplifies to Y(s) = 4e^(-3s) / (s^2 - 3s + 2).

So, the Laplace transform of the solution to the initial value problem is Y(s) = 4e^(-3s) / ((s-1)(s-2)).

This problem has been solved

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