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URLhttps://math-physics-problems.fandom.com/wiki/Laplace_Transform
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Meta TitleLaplace Transform | Math & Physics Problems Wikia | Fandom
Meta DescriptionSolve the differential equation y ″ āˆ’ y ′ āˆ’ 2 y = 4 e āˆ’ t {\displaystyle y'' - y'- 2y = 4{e}^{-t} } subject to the initial-values y ( 0 ) = 0 {\displaystyle y(0) = 0 } and y ′ ( 0 ) = 0. {\displaystyle y'(0)=0.} Check the table of Laplace transforms (Figure 1) for the relevant Laplace...
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Problem [ ] Solve the differential equation subject to the initial-values and Figure 1. Illustrative description of the Laplace transform Solution [ ] Figure 2. Table of Laplace transforms Check the table of Laplace transforms (Figure 1) for the relevant Laplace transformations. The following Laplace transforms will be useful for this differential equation. This converts the differential equation into the following equation Solving for gives By partial fractions decomposition, we get The inverse Laplace transform of is Therefore the solution to this initial-value problem (IVP) is
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Illustrative description of the Laplace transform ## **Solution**\[ \] [![Figure 2](https://static.wikia.nocookie.net/math-physics-problems/images/a/ae/Laplacetable-140326134619-phpapp02-thumbnail-4.jpg/revision/latest/scale-to-width-down/330?cb=20190424155627)](https://static.wikia.nocookie.net/math-physics-problems/images/a/ae/Laplacetable-140326134619-phpapp02-thumbnail-4.jpg/revision/latest?cb=20190424155627) Figure 2. Table of Laplace transforms Check the table of Laplace transforms (Figure 1) for the relevant Laplace transformations. The following Laplace transforms will be useful for this differential equation. L \[ y \] \= Y ( s ) L \[ y ′ \] \= s Y ( s ) āˆ’ y ( 0 ) L \[ y ″ \] \= s 2 Y ( s ) āˆ’ s ā‹… y ( 0 ) āˆ’ y ′ ( 0 ) L \[ e a t \] \= 1 s āˆ’ a {\\displaystyle {\\begin{aligned}\&L\[y\]=Y(s)\\\\\[5pt\]\&L\[y'\]=sY(s)-y(0)\\\\\[5pt\]\&L\[y''\]=s^{2}Y(s)-s\\cdot y(0)-y'(0)\\\\\[5pt\]\&L\[{e}^{at}\]={\\frac {1}{s-a}}\\end{aligned}}} ![{\\displaystyle {\\begin{aligned}\&L\[y\]=Y(s)\\\\\[5pt\]\&L\[y'\]=sY(s)-y(0)\\\\\[5pt\]\&L\[y''\]=s^{2}Y(s)-s\\cdot y(0)-y'(0)\\\\\[5pt\]\&L\[{e}^{at}\]={\\frac {1}{s-a}}\\end{aligned}}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/3a1be5e35e46ff12bf7a10aba4190928a32671d2) This converts the differential equation into the following equation ( s 2 Y ( s ) āˆ’ s ā‹… 0 āˆ’ 0 ) āˆ’ ( s Y ( s ) āˆ’ 0 ) āˆ’ 2 Y ( s ) \= 4 s \+ 1 Y ( s ) ( s 2 āˆ’ s āˆ’ 2 ) \= 4 s \+ 1 {\\displaystyle {\\begin{aligned}\\left(s^{2}Y(s)-s\\cdot 0-0\\right)-\\left(sY(s)-0\\right)-2Y(s)&={\\frac {4}{s+1}}\\\\\[5pt\]Y(s)\\left(s^{2}-s-2\\right)&={\\frac {4}{s+1}}\\\\\[5pt\]\\end{aligned}}} ![{\\displaystyle {\\begin{aligned}\\left(s^{2}Y(s)-s\\cdot 0-0\\right)-\\left(sY(s)-0\\right)-2Y(s)&={\\frac {4}{s+1}}\\\\\[5pt\]Y(s)\\left(s^{2}-s-2\\right)&={\\frac {4}{s+1}}\\\\\[5pt\]\\end{aligned}}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/cd46f1c21ca98daf4a45e961d6062d1617bdd662) Solving for Y ( s ) {\\displaystyle Y(s)} ![{\\displaystyle Y(s)}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/ee6d07ddc2098d5b3919b899b70ce79e013548c0) givesY ( s ) \= 4 ( s āˆ’ 2 ) ( s \+ 1 ) 2 {\\displaystyle Y(s) = \\frac{4}{(s-2){(s+1)}^{2}} } ![{\\displaystyle Y(s)={\\frac {4}{(s-2){(s+1)}^{2}}}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/da7dca04aad5fe28ccb26f1f028ec225775fd05a) By partial fractions decomposition, we get Y ( s ) \= 4 / 9 s āˆ’ 2 \+ āˆ’ 4 / 9 s \+ 1 \+ āˆ’ 4 / 3 ( s \+ 1 ) 2 {\\displaystyle Y(s) = \\frac{4/9}{s-2} + \\frac{-4/9}{s+1} + \\frac{-4/3}{{(s+1)}^{2}} } ![{\\displaystyle Y(s)={\\frac {4/9}{s-2}}+{\\frac {-4/9}{s+1}}+{\\frac {-4/3}{{(s+1)}^{2}}}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/4369f5a2168af6db8bf4a217934b2d66c377705e) The inverse Laplace transform of Y ( s ) {\\displaystyle Y(s)} ![{\\displaystyle Y(s)}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/ee6d07ddc2098d5b3919b899b70ce79e013548c0) is L āˆ’ 1 \[ Y ( s ) \] \= 4 9 e 2 t āˆ’ 4 9 e āˆ’ t āˆ’ 4 3 t e āˆ’ t {\\displaystyle {L}^{-1} \[Y(s)\] = \\frac{4}{9} {e}^{2t} - \\frac{4}{9} {e}^{-t} - \\frac{4}{3} t {e}^{-t} } ![{\\displaystyle {L}^{-1}\[Y(s)\]={\\frac {4}{9}}{e}^{2t}-{\\frac {4}{9}}{e}^{-t}-{\\frac {4}{3}}t{e}^{-t}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/0c3cef9f7f0cbcb14b85b9827534d60d2c76b96e) Therefore the solution to this initial-value problem (IVP) is y ( t ) \= 4 9 e 2 t āˆ’ 4 9 e āˆ’ t āˆ’ 4 3 t e āˆ’ t {\\displaystyle y(t) = \\frac{4}{9} {e}^{2t} - \\frac{4}{9} {e}^{-t} - \\frac{4}{3} t {e}^{-t}} ![{\\displaystyle y(t)={\\frac {4}{9}}{e}^{2t}-{\\frac {4}{9}}{e}^{-t}-{\\frac {4}{3}}t{e}^{-t}}](https://services.fandom.com/mathoid-facade/v1/media/math/render/svg/d0dc0a8511dcc8f5b39ec6607366fe87cd386a09) Categories - [Categories](https://math-physics-problems.fandom.com/wiki/Special:Categories "Special:Categories"): - [Differential Equations](https://math-physics-problems.fandom.com/wiki/Category:Differential_Equations "Category:Differential Equations") Community content is available under [CC-BY-SA](https://www.fandom.com/licensing) unless otherwise noted. 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