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OpenStudy (anonymous):
z^2-81/7z+28 * z+4/z-9 multiply & simplify someone plz help i cant figure out this answer
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OpenStudy (anonymous):
\[{z^2-81 \over 7z+28}.{z+8 \over z-9}={(z+9)(z-9) \over 7(z+8)}.{z+8 \over z-9}={z+9 \over 7}\]
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