Is the below the correct partial fraction decomposition? (s^2−6s+9)/((s−2)^3)=(A)/(s−2)+(B)/((s−2)^2)+(C)/((s−2)^3)

shiya43

shiya43

Answered question

2022-10-29

Is the below the correct partial fraction decomposition?
s 2 6 s + 9 ( s 2 ) 3 = A s 2 + B ( s 2 ) 2 + C ( s 2 ) 3
I can see that the numerator doesn't have a factor of (s−2) so I can't see how I can simplify it any further. But I wasn't sure if that is the proper method for decomposing the factors on the next denominators.

Answer & Explanation

Kyle Delacruz

Kyle Delacruz

Beginner2022-10-30Added 21 answers

Just note that the numerator is ( s 3 ) 2 , then you can use
( x y ) 2 = x 2 2 x y + y 2
which gives
( s 2 1 ) 2 ( s 2 ) 3 = ( s 2 ) 2 2 ( s 2 ) 1 + 1 2 ( s 2 ) 3
this gives
A=1,B=−2,C=1

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