Initial Value Problem using Laplace

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SUMMARY

The discussion focuses on solving the initial value problem defined by the differential equation x''(t) + 6x'(t) + 9x(t) = f(t) with initial conditions x(0) = N and x'(0) = M. The participant derived the Laplace transform X(s) = (F(t) + Ns + 6N + M) / (s^2 + 15) but encountered confusion regarding the correct application of the Laplace transform. Key mistakes identified include mislabeling the Laplace transform of f(t) as F(t) and misunderstanding the transforms of x''(t) and x'(t).

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  • Understanding of Laplace transforms
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  • Familiarity with initial value problems
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  • Review the properties of Laplace transforms, specifically for derivatives
  • Study the correct application of initial conditions in Laplace transforms
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Is this problem possible?

Solve the initial value problem

x''(t) + 6x'(t) + 9x(t) = f(t); x(0) = N, x'(0) = M

I get to

X(s)=(F(t)+Ns+6N+M)/(s^2+15)

and don't know where to go from here. Any help would be appreciated.
 
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I get to X(s)=(F(t)+Ns+6N+M)/(s^2+15)
It seems that there are several mistakes.
The Laplace transform of x(t) is X(s). With x(0) = N, x'(0) = M ,
what is the Laplace transform of x''(t) ?
what is the Laplace transform of x'(t) ?
what is the Laplace transform of f(t) ? ... it is not F(t).
 

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