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Express (x+7)/((x+1)(x+3)) as P/(x+1) + Q/(x+3); then P + Q is
A-1
B2
C1
D3
Answer & Solution
Correct answer: C. 1
At x = -1, A = 6/2 = 3; at x = -3, B = 4/(-2) = -2; so A + B = 1.
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