Question

Question
If w is cube root of unity then prove
(3-w2)(3+w)=18​

Answer 1

Step-by-step explanation:

9+3w-3w²-w³

Atq

w³=1 , w²+w +1 = 0 given

-3w²+3w -1 +9

3(-w²+w+1) + 5

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