Originally Posted by thedoge on 3... I have it to $\displaystyle X(s) = \frac{-13s^3+4s-36}{s^2(s^2+13)} $ Now do I do partial fractions like this? $\displaystyle X(s) = \frac{Ax+B}{s^2} + \frac{Cx+D}{s^2+13} $ The correct form should be $\displaystyle \frac{-13s^3+4s-36}{s^2(s^2+13)}=\frac{A}{s}+\frac{B}{s^2}+\frac{C s+D}{s^2+13}$
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