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| Meta Title | Using Laplace Transforms. What are Laplace transforms and how do⦠| by William Keens | The Mathsy Way | Medium |
| Meta Description | Laplace transforms are an amazing tool that you need in your arsenal for solving differential equations. They are a foolproof way of solving for the solution and allow you to bypass all wasted time⦠|
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| Boilerpipe Text | Photo by Michael Dziedzic on Unsplash Laplace transforms are an amazing tool that you need in your arsenal for solving differential equations. They are a foolproof way of solving for the solution and allow you to bypass all wasted time in trying to guess a solution to any random equation. Here it is: Laplace transform equation ( made with Latex ) It works by enabling you to convert differential equations into algebraic equations that we know how to solve. This transform from what is known as t-space to s-space allows us to then reverse the process to find the general solution equation. (We also often use just the capital letter to mean the Laplace transform of a given function which you may see later) Letās see how it can be used to turn a derivative of a function into an algebraic expression involving it. Laplace of derivative ( made with Latex ) Solution of derivative, when transformed ( made with Latex ) Now this may be a lot to unpack if you are not used to it, but I shall try to explain. First, we use integration by parts to get y(x) on its own inside the integral with no other factors of the given function. The just by simplifying we can see that this integral is s multiplied by the Laplace transform of y(x). This gives us a general rule: Derivative rule ( made with Latex ) Now there is only one thing to see before we get started on our first differential equation. What are some Laplace transforms? |
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Maths Concepts explained simply.
# Using Laplace Transforms
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[William Keens](https://medium.com/@william-k?source=post_page---byline--f8148e0e6986---------------------------------------)
4 min read
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Jun 28, 2023
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Laplace transforms are an amazing tool that you need in your arsenal for solving differential equations. They are a foolproof way of solving for the solution and allow you to bypass all wasted time in trying to guess a solution to any random equation. Here it is:
![]()
Laplace transform equation ([made with Latex](https://latexeditor.lagrida.com/))
It works by enabling you to convert differential equations into algebraic equations that we know how to solve. This transform from what is known as t-space to s-space allows us to then reverse the process to find the general solution equation. (We also often use just the capital letter to mean the Laplace transform of a given function which you may see later)
Letās see how it can be used to turn a derivative of a function into an algebraic expression involving it.
![]()
Laplace of derivative ([made with Latex](https://latexeditor.lagrida.com/))
Press enter or click to view image in full size
![]()
Solution of derivative, when transformed ([made with Latex](https://latexeditor.lagrida.com/))
Now this may be a lot to unpack if you are not used to it, but I shall try to explain.
1. First, we use integration by parts to get y(x) on its own inside the integral with no other factors of the given function.
2. The just by simplifying we can see that this integral is s multiplied by the Laplace transform of y(x).
This gives us a general rule:
![]()
Derivative rule ([made with Latex](https://latexeditor.lagrida.com/))
Now there is only one thing to see before we get started on our first differential equation. What are some Laplace transforms?
# **1\) Constant**
![]()
Constant rule ([made with Latex](https://latexeditor.lagrida.com/))
# 2\) Exponential
![]()
Exponential Rule ([made with Latex](https://latexeditor.lagrida.com/))
If you want to get more examples please consult the Wikipedia page on this very topic
> <https://en.wikipedia.org/wiki/Laplace_transform#Table_of_selected_Laplace_transforms>
Now we are ready to tackle our first equation\!
# Solving a Differential Equation
We shall start out with this equation below.
![]()
1st Order ODE ([made with Latex](https://latexeditor.lagrida.com/))
Now as we have done before we can take the Laplace transform of this equation. Now due to the fact the Laplace transform is an Integral it has a nice property that we can split all things added inside it into added outside the Function.
![]()
Laplace of everything ([made with Latex](https://latexeditor.lagrida.com/))
Now we have learnt all of these and can evaluate this expression.
![]()
Evaluate it ([made with Latex](https://latexeditor.lagrida.com/))
This expression can now be rearranged to find Y(s).
![]()
Simplify ([made with Latex](https://latexeditor.lagrida.com/))
![]()
Simplify further ([made with Latex](https://latexeditor.lagrida.com/))
Press enter or click to view image in full size
![]()
Partial fractions ([made with Latex](https://latexeditor.lagrida.com/))
Here now that we have a āniceā expression for Y(s) we can perform the inverse Laplace transform by pattern spotting.
![]()
Inverse Laplace transform ([made with Latex](https://latexeditor.lagrida.com/))
![]()
Evaluated the ODE ([made with Latex](https://latexeditor.lagrida.com/))
And by that we have solved the equation.
If you would like to learn more about Laplace Transforms, I would extremely encourage you to do your own research and find whatever quirky equation floats your boat and as always.
Have fun and never stop solving.
[5 Laplace Transforms with Solutions A Guide to how to evaluate different Laplace Transforms. william-k.medium.com](https://william-k.medium.com/5-laplace-transforms-with-solutions-92722efebf77?source=post_page-----f8148e0e6986---------------------------------------)
[Piecewise Laplace Transforms The Lego Bricks of the maths world medium.com](https://medium.com/the-mathsy-way/piecewise-laplace-transforms-c6ece20e27c2?source=post_page-----f8148e0e6986---------------------------------------)
[Differential Equations](https://medium.com/tag/differential-equations?source=post_page-----f8148e0e6986---------------------------------------)
[Laplace Transforms](https://medium.com/tag/laplace-transforms?source=post_page-----f8148e0e6986---------------------------------------)
[Mathematics](https://medium.com/tag/mathematics?source=post_page-----f8148e0e6986---------------------------------------)
[Laplace](https://medium.com/tag/laplace?source=post_page-----f8148e0e6986---------------------------------------)
[Calculus](https://medium.com/tag/calculus?source=post_page-----f8148e0e6986---------------------------------------)
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