# Laplace transforms

Discussion in 'Math' started by full, Dec 1, 2014.

1. ### full Thread Starter Member

May 3, 2014
225
2
hello
Determine the Laplace transforms of these functions:
I see the table for laplace but I do not find same this in table !
what I will do?

May 3, 2014
225
2
3. ### WBahn Moderator

Mar 31, 2012
18,091
4,917
You use what are generally called "operational transforms" to manipulate this into a form for which you have a "functional transform" in the table.

For instance, could you work any of the following:

f(t) = t·u(t)

f(t) = (t - 2 sec)·u(t - 2 sec)

f(t) = (t - 2 sec)·u(t)

f(t) = t·u(t - 2 sec)

4. ### amilton542 Active Member

Nov 13, 2010
494
64
@WBahn

I don't think he's familiar with the (t-a) shift nor the unit-step (Heaviside) function. That's what the confusion is, I think.

5. ### WBahn Moderator

Mar 31, 2012
18,091
4,917
Which is why I asked which, if any, of those forms he could work. Trying to narrow down where the boundary is of what he does and doesn't know so that we have someplace to start.