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If a^(2) + a + 1 = 0 then the value of...

If ` a^(2) + a + 1 = 0` then the value of ` a^(9)` is

A

1

B

0

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
A

`a^(2)+a+1=0`
दोनों ओर (a - 1) से गुणा करने पर
`(a-1)(a^(2)+a+1)=0`
`rArr a^(3)-1=0`
`rArr a^(2)=1`
`rArr a=1`
`:.a^(9)=(1)^(2)=1`
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