- #1
CremeBrulee
- 8
- 0
I am having trouble to find a straight forward method for finding coefficients using partial fraction expansion with repeated or complex roots. My study notes arent too clear so I am finding the differentiation method hard to follow for repeated roots. As for complex roots I can find the roots using quadratic formula but then not sure how to find the coefficients? Are there any simple methods out there that can used used for these types of equations?Any help would be appriciated?
Repeated roots
4/s(s+1)^2
4/s(s+1)^2=k1/s + k2/s+1 + k3/(s+1)^2
k1=4; k3=-4 (Using cover up method)
k2=??
Complex roots
2/s(s^2+s+1)
(s^2+s+1) = -1/2 +/- j sqrt(3/2)
Repeated roots
4/s(s+1)^2
4/s(s+1)^2=k1/s + k2/s+1 + k3/(s+1)^2
k1=4; k3=-4 (Using cover up method)
k2=??
Complex roots
2/s(s^2+s+1)
(s^2+s+1) = -1/2 +/- j sqrt(3/2)