Hi,

I need help simplifying the following so that i can use the Laplace transforms table

LT[y] = (2/3s^2 -5s -2)/ (s^3 -3s^2 -1)

Thank in advance,

ArTiCk

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- Oct 9th 2009, 03:42 PMArTiCKSimplifying Laplace transform
Hi,

I need help simplifying the following so that i can use the Laplace transforms table

LT[y] = (2/3s^2 -5s -2)/ (s^3 -3s^2 -1)

Thank in advance,

ArTiCk - Oct 9th 2009, 08:38 PMmr fantastic
- Oct 9th 2009, 08:46 PMchisigma
If You write the LT as...

(1)

... where and are both polynomial in s, and You 'factorize' as follows ...

(2)

... the LT can be written as...

(3)

... where...

(4)

In your case is a polynomial of order 3 and its roots are...

Kind regards

- Oct 9th 2009, 08:50 PMmr fantastic
**IF**the given expression is correct (and I doubt that it is) then the technique would be to factorise the denominator in a linear factor and an irreducible quadratic factor and then use a partical fraction decomposition. The difficulty of doing this convinces me that the given expression, wherever it has come from, is wrong. - Oct 10th 2009, 12:22 AMCaptainBlack
- Oct 10th 2009, 02:49 AMArTiCK
Hi all,

I would like to apologise for causing so much trouble. I tried to delete this post but i couldn't find a button to do so. As Mr. F has mentioned i have made a mistake earlier on in my calculations. I appreciate all the help that all you guys have given.

Sorry once again,

ArTiCk