ā¹ļø Skipped - page is already crawled
| Filter | Status | Condition | Details |
|---|---|---|---|
| HTTP status | PASS | download_http_code = 200 | HTTP 200 |
| Age cutoff | PASS | download_stamp > now() - 6 MONTH | 2.9 months ago |
| History drop | PASS | isNull(history_drop_reason) | No drop reason |
| Spam/ban | PASS | fh_dont_index != 1 AND ml_spam_score = 0 | ml_spam_score=0 |
| Canonical | PASS | meta_canonical IS NULL OR = '' OR = src_unparsed | Not set |
| Property | Value |
|---|---|
| URL | https://math-physics-problems.fandom.com/wiki/Laplace_Transform |
| Last Crawled | 2026-01-16 06:57:18 (2 months ago) |
| First Indexed | not set |
| HTTP Status Code | 200 |
| Meta Title | Laplace Transform | Math & Physics Problems Wikia | Fandom |
| Meta Description | Solve the differential equation y ā³ ā y ā² ā 2 y = 4 e ā t {\displaystyle y'' - y'- 2y = 4{e}^{-t} } subject to the initial-values y ( 0 ) = 0 {\displaystyle y(0) = 0 } and y ā² ( 0 ) = 0. {\displaystyle y'(0)=0.} Check the table of Laplace transforms (Figure 1) for the relevant Laplace... |
| Meta Canonical | null |
| Boilerpipe Text | 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 |
| Markdown | [Sign In](https://auth.fandom.com/signin?source=mw&redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform)
[Register](https://auth.fandom.com/register?source=mw&redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform)
[](https://math-physics-problems.fandom.com/) [Math & Physics Problems Wikia](https://math-physics-problems.fandom.com/)
- Explore
- [Main Page](https://math-physics-problems.fandom.com/wiki/Math_%26_Physics_Problems_Wikia)
- [Discuss](https://math-physics-problems.fandom.com/f)
- [All Pages](https://math-physics-problems.fandom.com/wiki/Special:AllPages)
- [Community](https://math-physics-problems.fandom.com/wiki/Special:Community)
- [Interactive Maps](https://math-physics-problems.fandom.com/wiki/Special:AllMaps)
- [Recent Blog Posts](https://math-physics-problems.fandom.com/Blog:Recent_posts)
- Popular pages
- Most visited articles
- [Stopped Pipe and Open Pipe](https://math-physics-problems.fandom.com/wiki/Stopped_Pipe_and_Open_Pipe)
- [Brahmagupta (ą¤¬ą„ą¤°ą¤¹ą„ą¤®ą¤ą„ą¤Ŗą„ą¤¤)](https://math-physics-problems.fandom.com/wiki/Brahmagupta_\(%E0%A4%AC%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A5%8D%E0%A4%AE%E0%A4%97%E0%A5%81%E0%A4%AA%E0%A5%8D%E0%A4%A4\))
- [Ideological Subversion Interview](https://math-physics-problems.fandom.com/wiki/Ideological_Subversion_Interview)
- [Sig-Figs](https://math-physics-problems.fandom.com/wiki/Sig-Figs)
- [Zhang Heng 張蔔](https://math-physics-problems.fandom.com/wiki/Zhang_Heng_%E5%BC%B5%E8%A1%A1)
- [Springs in Series and Parallel](https://math-physics-problems.fandom.com/wiki/Springs_in_Series_and_Parallel)
- [Volume of the Paraboloid](https://math-physics-problems.fandom.com/wiki/Volume_of_the_Paraboloid)
- [Ancient puzzles](http://math-physics-problems.wikia.com/wiki/Category:Ancient_puzzles)
- [Physics](http://math-physics-problems.wikia.com/wiki/Category:Physics)
- [History of Math](http://math-physics-problems.wikia.com/wiki/Category:History_of_Math)
- [Resources](http://math-physics-problems.wikia.com/wiki/Category:Resources)
- Community
- [Recent blog posts](https://math-physics-problems.fandom.com/wiki/Blog:Recent_posts)
- Forum
[Sign In](https://auth.fandom.com/signin?source=mw&redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform)
Don't have an account?
[Register](https://auth.fandom.com/register?source=mw&redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform)
***
[Sign In](https://auth.fandom.com/signin?source=mw&redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform)
Menu
Explore
More
History
Advertisement
[Skip to content](https://math-physics-problems.fandom.com/wiki/Laplace_Transform#page-header)
[](https://math-physics-problems.fandom.com/)
[Math & Physics Problems Wiki](https://math-physics-problems.fandom.com/)
536
pages
- Explore
- [Main Page](https://math-physics-problems.fandom.com/wiki/Math_%26_Physics_Problems_Wikia)
- [Discuss](https://math-physics-problems.fandom.com/f)
- [All Pages](https://math-physics-problems.fandom.com/wiki/Special:AllPages)
- [Community](https://math-physics-problems.fandom.com/wiki/Special:Community)
- [Interactive Maps](https://math-physics-problems.fandom.com/wiki/Special:AllMaps)
- [Recent Blog Posts](https://math-physics-problems.fandom.com/Blog:Recent_posts)
- Popular pages
- Most visited articles
- [Stopped Pipe and Open Pipe](https://math-physics-problems.fandom.com/wiki/Stopped_Pipe_and_Open_Pipe)
- [Brahmagupta (ą¤¬ą„ą¤°ą¤¹ą„ą¤®ą¤ą„ą¤Ŗą„ą¤¤)](https://math-physics-problems.fandom.com/wiki/Brahmagupta_\(%E0%A4%AC%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A5%8D%E0%A4%AE%E0%A4%97%E0%A5%81%E0%A4%AA%E0%A5%8D%E0%A4%A4\))
- [Ideological Subversion Interview](https://math-physics-problems.fandom.com/wiki/Ideological_Subversion_Interview)
- [Sig-Figs](https://math-physics-problems.fandom.com/wiki/Sig-Figs)
- [Zhang Heng 張蔔](https://math-physics-problems.fandom.com/wiki/Zhang_Heng_%E5%BC%B5%E8%A1%A1)
- [Springs in Series and Parallel](https://math-physics-problems.fandom.com/wiki/Springs_in_Series_and_Parallel)
- [Volume of the Paraboloid](https://math-physics-problems.fandom.com/wiki/Volume_of_the_Paraboloid)
- [Ancient puzzles](http://math-physics-problems.wikia.com/wiki/Category:Ancient_puzzles)
- [Physics](http://math-physics-problems.wikia.com/wiki/Category:Physics)
- [History of Math](http://math-physics-problems.wikia.com/wiki/Category:History_of_Math)
- [Resources](http://math-physics-problems.wikia.com/wiki/Category:Resources)
- Community
- [Recent blog posts](https://math-physics-problems.fandom.com/wiki/Blog:Recent_posts)
- Forum
in: [Differential Equations](https://math-physics-problems.fandom.com/wiki/Category:Differential_Equations "Category:Differential Equations")
# Laplace Transform
[Sign in to edit](https://auth.fandom.com/signin?redirect=https%3A%2F%2Fmath-physics-problems.fandom.com%2Fwiki%2FLaplace_Transform%3Fveaction%3Dedit&uselang=en)
- [History](https://math-physics-problems.fandom.com/wiki/Laplace_Transform?action=history)
- [Purge](https://math-physics-problems.fandom.com/wiki/Laplace_Transform?action=purge)
- [Talk (0)](https://math-physics-problems.fandom.com/wiki/Talk:Laplace_Transform?action=edit&redlink=1)
## **Problem**\[ \]
Solve the differential equationy ā³ ā y ā² ā 2 y \= 4 e ā t {\\displaystyle y'' - y'- 2y = 4{e}^{-t} } subject to the initial-values y ( 0 ) \= 0 {\\displaystyle y(0) = 0 } andy ā² ( 0 ) \= 0\. {\\displaystyle y'(0)=0.} 
[](https://static.wikia.nocookie.net/math-physics-problems/images/b/b8/Laplace-Transform-of-Elementary-Functions-1.jpg/revision/latest?cb=20190424155257)
Figure 1. Illustrative description of the Laplace transform
## **Solution**\[ \]
[](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
\[
y
ā²
\]
\=
s
Y
(
s
)
ā
y
(
0
)
L
\[
y
ā³
\]
\=
s
2
Y
(
s
)
ā
s
ā
y
(
0
)
ā
y
ā²
(
0
)
L
\[
e
a
t
\]
\=
1
s
ā
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
)
ā
s
ā
0
ā
0
)
ā
(
s
Y
(
s
)
ā
0
)
ā
2
Y
(
s
)
\=
4
s
\+
1
Y
(
s
)
(
s
2
ā
s
ā
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)}  givesY ( s ) \= 4 ( s ā 2 ) ( s \+ 1 ) 2 {\\displaystyle Y(s) = \\frac{4}{(s-2){(s+1)}^{2}} } 
By partial fractions decomposition, we get
Y
(
s
)
\=
4
/
9
s
ā
2
\+
ā
4
/
9
s
\+
1
\+
ā
4
/
3
(
s
\+
1
)
2
{\\displaystyle Y(s) = \\frac{4/9}{s-2} + \\frac{-4/9}{s+1} + \\frac{-4/3}{{(s+1)}^{2}} }

The inverse Laplace transform of Y ( s ) {\\displaystyle Y(s)}  is
L
ā
1
\[
Y
(
s
)
\]
\=
4
9
e
2
t
ā
4
9
e
ā
t
ā
4
3
t
e
ā
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
ā
4
9
e
ā
t
ā
4
3
t
e
ā
t
{\\displaystyle y(t) = \\frac{4}{9} {e}^{2t} - \\frac{4}{9} {e}^{-t} - \\frac{4}{3} t {e}^{-t}}

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.
Advertisement
## [](https://www.fandom.com/ "Fandom logo")
### Explore properties
- [Fandom](https://www.fandom.com/)
- [Fanatical](https://www.fanatical.com/)
- [GameSpot](https://www.gamespot.com/)
- [Metacritic](https://www.metacritic.com/)
- [TV Guide](https://www.tvguide.com/)
- [Honest Entertainment](https://www.youtube.com/user/screenjunkies)
### Follow Us
### Overview
- [What is Fandom?](https://www.fandom.com/what-is-fandom)
- [About](https://www.fandom.com/about)
- [Careers](https://www.fandom.com/careers)
- [Press](https://www.fandom.com/press)
- [Contact](https://www.fandom.com/about#contact)
- [Terms of Use](https://www.fandom.com/terms-of-use)
- [Privacy Policy](https://www.fandom.com/privacy-policy)
- [Digital Services Act](https://www.fandom.com/digital-services-act)
- [Global Sitemap](https://community.fandom.com/Sitemap)
- [Local Sitemap](https://math-physics-problems.fandom.com/wiki/Local_Sitemap)
### Community
- [Community Central](https://community.fandom.com/wiki/Community_Central)
- [Support](https://fandom.zendesk.com/)
- [Help](https://community.fandom.com/wiki/Help:Contents)
### Advertise
- [Media Kit](https://about.fandom.com/mediakit)
- [Contact](https://about.fandom.com/mediakit#contact)
### Fandom Apps
Take your favorite fandoms with you and never miss a beat.

- [](https://apps.apple.com/us/app/fandom-videos-news-reviews/id1230063803)
- [](https://play.google.com/store/apps/details?id=com.fandom.app&referrer=utm_source%3Dwikia%26utm_medium%3Dglobalfooter)
Math & Physics Problems Wikia is a Fandom Lifestyle Community.
View Mobile Site |
| Readable Markdown | null |
| Shard | 198 (laksa) |
| Root Hash | 11439660390604180198 |
| Unparsed URL | com,fandom!math-physics-problems,/wiki/Laplace_Transform s443 |