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# im confused

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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