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If w ne 1 is a cube root of unity and De...

If `w ne 1` is a cube root of unity and `Delta=|{:(x+w^(2),w,1),(w,w^(2),1+x),(1,x+w,w^(2)):}|=0`, then value of `x` is

A

`0`

B

`2`

C

`-1`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
`(a)` Applying `C_(1)toC_(1)+C_(2)+C_(3)`.
We get `Delta=|{:(x+w^(2)+w+1,w,1),(w+w^(2)+1+x,w^(2),1+x),(1+x+w+w^(2),x+w,w^(2)):}|`
`=|{:(x,w,1),(x,w^(2),1+x),(x,x+w,w^(2)):}|` [using `1+w+w^(2)=0`]
`Delta` is clearly equal to `0` for `x=0`.
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