Friday, March 21, 2014

`(3x)/(x - 3)^2` Write the partial fraction decomposition of the rational expression. Check your result algebraically.

`(3x)/(x-3)^2`


Let`(3x)/(x-3)^2=A/(x-3)+B/(x-3)^2`


`(3x)/(x-3)^2=(A(x-3)+B)/(x-3)^2`


`:.3x=A(x-3)+B`


`3x=Ax-3A+B`


equating the coefficients of the like terms,


`A=3`


`-3A+B=0`


plug the value of the A in the above equation,


`-3(3)+B=0`


`-9+B=0`


`B=9`


`:.(3x)/(x-3)^2=3/(x-3)+9/(x-3)^2`


`(3x)/(x-3)^2`


Let`(3x)/(x-3)^2=A/(x-3)+B/(x-3)^2`


`(3x)/(x-3)^2=(A(x-3)+B)/(x-3)^2`


`:.3x=A(x-3)+B`


`3x=Ax-3A+B`


equating the coefficients of the like terms,


`A=3`


`-3A+B=0`


plug the value of the A in the above equation,


`-3(3)+B=0`


`-9+B=0`


`B=9`


`:.(3x)/(x-3)^2=3/(x-3)+9/(x-3)^2`


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