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Constants A and B satisfy (5x+1)/((x-1)(x+2)) = A/(x-1) + B/(x+2). Their product is
A5
B-6
C6
D8
Answer & Solution
Correct answer: C. 6
A = 6/3 = 2 at x = 1 and B = -9/(-3) = 3 at x = -2, so AB = 6.
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