algebra

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

  • algebra -

    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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