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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` |
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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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