# Laplace Transformation

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• May 6th 2008, 06:55 AM
Altair
Laplace Transformation
I was attempting the following question,

$\displaystyle f(t) ={k ( 1 - \frac{t}{c}) , 0 <= t < c}$ and $\displaystyle { 0 , t >= c}$

The problem I am having is that I can't understand why are the ranges given ? This is the first question of its type and I am totally confused that where should I start because the questions I attempted before were simple like $\displaystyle e^{3t + 4}$ and I had to just transform them. When I use that same simple transformation technique on the above question the answer comes incorrect.

Please advice.
• May 6th 2008, 10:09 PM
mr fantastic
Quote:

Originally Posted by Altair
I was attempting the following question,

$\displaystyle f(t) ={k ( 1 - \frac{t}{c}) , 0 <= t < c}$ and $\displaystyle { 0 , t >= c}$

The problem I am having is that I can't understand why are the ranges given ? This is the first question of its type and I am totally confused that where should I start because the questions I attempted before were simple like $\displaystyle e^{3t + 4}$ and I had to just transform them. When I use that same simple transformation technique on the above question the answer comes incorrect.

Please advice.

Required preliminary reading: Laplace Transforms - 1a. The Unit Step Function (Heaviside Function)