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IF a = cos ( (2 pi ) /(7)) + isin ((2p...

IF ` a = cos ( (2 pi ) /(7)) + isin ((2pi)/(7)) , alpha = a + a^2+a^4 and beta = a^3+a^5+a^6` then ` alpha , beta ` are the roots of the equation

A

`x^(2)+x+1=0`

B

`x^(2)+x+2=0`

C

`x^(2)+2x+2=0`

D

`x^(2)+2x+3=0`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-QUADRATIC EQUATIONS & EXPRESSIONS-EXERCISE-II
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