Sunday, February 28, 2010

Write the partial fraction decomposition of the rational expression. Check your result algebraically.


Let's factorize the denominator,




Let 







equating the coefficients of the like terms,


       - equation 1


    - equation 2


              - equation 3



Plug the value of A in equation 1,





Substitute the above expression of C in equation 2,




      - equation 4


Now solve equations 3 and 4 to get the solutions of B and D,


Subtract equation 3 from equation 4,





Plug the value of B in equation 3,




Plug the value of A and B in equation 1,





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