Question

prov
e that (1+w-w²).(1-w+w²)=4​

Answer 1

we know 1+w+w2 = 0

hence we can write 1 + w = –w2 & 1 + w2 = –w

now ( –w –w)( –w2 –w2) = (–2w)* (–2w2)

4 w3 = 4  hence proved(we know that w3 = 1)

hope it helped