Question

aw + bw2 + c
If A =
at bwt cw²
then A=
a) ω
ОО
b) w2
O c)1
O d) none of these​

Answer 1

Step-by-step explanation:

Since w being cube root of unity then w3=1.

Then, 

(c+aw+bw2)(a+bw+cw2)

=w2w2(c+aw+bw2)(a+bw+cw2)

=w2(a+bw+cw2)(a+bw+cw2) [ Since w3=1,w4=w.]

=w2.