Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 10 - The Laplace Transform and Some Elementary Applications - 10.1 Definition of the Laplace Transform - Problems - Page 675: 20

Answer

$$\dfrac{2}{s+3}+\dfrac{4}{(s-1)}-\dfrac{5}{s^2+1}$$

Work Step by Step

The Laplace Transform can be written as: $L[F(t)]=\int_{0}^{\infty} e^{-st} f(t) dt $ We are given that $f(t)=2 e^{-3t}+4e^t-5 \sin t$ Now, $L[F(t)]= L[2 e^{-3t}+4e^t-5 \sin t] \\= L[2 e^{-3t}] +L[4e^{t}t]-L[5 \sin t]\\=\dfrac{(2)}{s+3}+\dfrac{4}{(s-1)}-\dfrac{5}{s^2+1}\\=\dfrac{2}{s+3}+\dfrac{4}{(s-1)}-\dfrac{5}{s^2+1}$
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