# Partial fractions

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• Mar 10th 2009, 01:16 PM
Jaffa
Partial fractions
I think you solve this by parial fractions,but not sure
The question is, the admittance of an electronic circuitis given by

A = 2f+1/(f+3)(f-3) where f is the frequency
(i) Express A as the sum of a partial fraction
(ii)Intregrate A with respect to f
• Mar 10th 2009, 02:09 PM
HallsofIvy
Quote:

Originally Posted by Jaffa
I think you solve this by parial fractions,but not sure
The question is, the admittance of an electronic circuitis given by

A = 2f+1/(f+3)(f-3) where f is the frequency
(i) Express A as the sum of a partial fraction
(ii)Intregrate A with respect to f

Well, the fact that it says "partial fractions" should ease any doubts you have! Partial fractions means choosing numbers A and B such that $\frac{2f+1}{(f+3)(f-3)}= \frac{A}{f+3}+ \frac{B}{f-3}$
One way to find A and B is to multiply both sides by (f-3)(f+3) to get rid of the fractions, the set f to whatever two values you want to get two equations to solve for A and B.