How do I take inverse Laplace transform of (-2s+3)/(s^2−2s+2)?

Humberto Campbell

Humberto Campbell

Answered question

2022-11-16

How do I take inverse Laplace transform of 2 s + 3 s 2 2 s + 2 ?

Answer & Explanation

Zoey Benitez

Zoey Benitez

Beginner2022-11-17Added 18 answers

To perform the inverse Laplace transform you need to complete the square at the denominator,
s 2 2 s + 2 = ( s 1 ) 2 + 1
so you rewrite your expression as
2 s + 3 ( s 1 ) 2 + 1 = 2 ( s 1 ) ( s 1 ) 2 + 1 + ( 3 2 ) ( s 1 ) 2 + 1
now these expressions are standard on tables "exponentially decaying sine/cosine wave. The inverse transform is then
e t ( 2 cos t + sin t ) .

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