__What is a Laplace Transform?__Laplace transforms can be used to solve differential equations. They turn differential equations into algebraic problems.

__Definition:__

Suppose f(t) is a piecewise continuous function, a function made up of a finite number of continuous pieces. The Laplace transform of f(t) is denoted L{f(t)} and defined as:

If you see , then you can assume that for , and then you can use the original definition of Laplace transform.

Now, we will get into how to compute Laplace transforms:

Laplace transforms can be computed using a table and the linearity property, “Given f(t) and g(t) then, .” The statement means that after you’ve taken the transform of the individual functions, then you can add back any constants and add or subtract the results.

Look at the table and see what functions you can transform. Algebraic manipulation may be required. The table will be your savior when it comes to these problems.

Simple enough! Let’s look at an example (click here):

This problem is very simple. It requires looking at the different functions, finding the corresponding transforms in the table, and then adding any constants and adding and subtracting the results together.

Here’s another example (click here):

Let’s get into inverse Laplace transforms!

__What is an inverse Laplace transform?__An inverse Laplace transform is when we are given a transform, F(s), and asked what function(s) we had originally.

__Definition:__

__How to compute the inverse Laplace transforms:__Just like Laplace transforms have a linearity property, so do inverse Laplace transforms. “Given the two Laplace transforms F(s) and G(s), then .”

When trying to computer the inverse Laplace transforms, it is important to first look at the denominator and then try to identify the transform based on that. If you can’t figure it out just based on looking at the denominator, look at the numerator. Sometime you may have to manipulate the numerator to get into the correct form needed.

Let’s see an example (click here):

By looking at the table, we can see that the denominator is almost the same as the denominator of the transform for . With some algebraic manipulation to the numerator, we are able to figure out the inverse Laplace transform.

Here’s another example (click here):

See, Laplace transforms aren’t that hard after all. They can get a little messy and can be take a long time to solve after first, but with more practice, the better you’ll get. Make sure you have that table handy!

Until next time,

Leah

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