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Suppose \[\frac{1}{x^3-x^2-21x+45}=\frac{A}{x+5}+\frac{B}{x-3} + \frac{C}{(x - 3)^2}\] where a,b,c are real constants. what is a?

 Sep 25, 2022
 #1
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Hint:

expand this and see what you get

(x+5)(x-3)^2

 Sep 26, 2022

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