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Questions  

If z1  and z2  are the complex roots of the equation (x3)3+1=0,  then z1+z2  equals to

a
1
b
3
c
5
d
7

detailed solution

Correct option is D

(x−3)3+1=0 ⇒(x−3−1)3=1⇒x−3−1=1,  ω,  ω2⇒ x=2,  3−ω,  3−ω2Hence, the sum of complex roots is 6−(ω+ω2) =6--1=7

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