factorise the following expression z2-12z+28
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z²-12z-28
z²-14z+2z-28
z(z-14)+2(z-14)
(z+2) (z-14)
z=-2 or z =14
z²-14z+2z-28
z(z-14)+2(z-14)
(z+2) (z-14)
z=-2 or z =14
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