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[tex]\frac{s}{\left(s^{2}+4\right)\left(s^{2}+9\right)}[/tex]

[tex]\frac{s}{\left(s^{2}+4\right)\left(s^{2}+9\right)}=\frac{A}{s^{2}+4}+\frac{B}{s^{2}+9}[/tex]

so

[tex]s=A\left(s^{2}+9\right)+B\left(s^{2}+4\right)[/tex]

i understand that i am supposed to strategically choose s to make A or B zero, but sith the s^2 i'm not sure what to do

thanks