if omega is an imaginary cube root of unity , then ( 1 +omega - omega^2)^7 equals

Answers (1)

Solution:    We know that ,   1+omega +omega ^2=0 & omega ^3=1

          Now ,   (1+omega -omega ^2)^7=(-omega ^2-omega ^2)^7=(-2omega ^2)^7=-128omega ^2

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