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If `(9x-13)/(x^(2)-2x-15)=(A)/(x+3)+(B)/(x-5)`, then `A+B` is ________.A. `9`B. `13`C. `12`D. `8`

Answer» Given, `(9x-13)/(x^(2)-2x-15)=(A)/(x+3)+(B)/(x-5)`
Consider, `9x-13=A(x-5)+B(x+3)`
`9x-13=Ax-5A+Bx+3B`
Comparing the coefficients of `x`, we get
`A+B=9`.


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