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if you noted 2-6+4=0 ⇒z₁=1 ⇒ one of factor is (z-1) so 2z²-2z-4z+4=0 (2z²-2z)-(4z-4)=0 2z(z-1)-4(z-1)=0 (z-1)(2z-4)=0 2z-4=0 2z=4 z₂=2 Answer: z₁=1, z₂=2
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