2*(z - 1) %2B z(z - 1) – InterviewSolution

1.

2*(z - 1) %2B z(z - 1)

Answer»

z (z-1)+2 (z-1)z^2-z+2z-2z^2+z-2

z(z-1)+2(z-1)=>(z+2)(z-1)

(z-1)(z+2) . both are factor of given equation

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