Question

TELL ME SOLUTION

THANKS

Answer 1

ω is an imaginary cube root of unity .

So : ω² + ω + 1 = 0

Now subtract ( - 2 ω² ) both sides :

==> ω - ω² + 1 = - 2 ω²

Take power of 7 both sides :

==> ( ω - ω² + 1 )⁷ = ( - 2 ω² )⁷

                            = ( - 2 )⁷ ω¹⁴

Note that : ω¹⁴ = ω¹²⁺²

                        = ω¹².ω²

                        = ( ω³)⁴.ω²

                        = 1⁴.ω² = ω²

Insert this value :

                            = ( - 128 ) ( ω ² )

The answer to your question is - 128 ω²

ANSWER : OPTION D

Hope it helps

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Answer 2

nhi aayga to me yhe ho abhi