## anonymous 5 years ago z^2-81/7z+28 * z+4/z-9 multiply & simplify someone plz help i cant figure out this answer

${z^2-81 \over 7z+28}.{z+8 \over z-9}={(z+9)(z-9) \over 7(z+8)}.{z+8 \over z-9}={z+9 \over 7}$