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Suppose $\frac{2(1-2x)}{x^2-x-2} = \frac{A}{x-2} + \frac{B}{x+1}$

How can I get the value of $A+B$ for my math exam?

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    If it helps, here you can find a few solved exercises of this type: http://tutorial.math.lamar.edu/Classes/CalcII/PartialFractions.aspx2011-11-13

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This should help. $ 2 - 4x = Ax + A + Bx - 2B = (A+B) x + (A-2B)$

Compare coefficients.

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    @Yusuf It's not clear what you mean. Do you want an elaboration of the answer? Which part do you not follow?2011-11-13