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posted by ll on Thursday, May 31, 2012 at 1:10pm.

multiply and simplify z^2-7z-18/z^2-4z+4*z-2/z-9

z^2-7z-18 = (z-9)(z+2) z^2-4z+4 = (z-2)(z-2) so, (z-9)(z+2)/(z-2)(z-2) * (z-2)/(z-9) = (z+2)/(z-2)

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