Question

Let $a = cos\frac{2π}7 + isin\frac{2π}7$, a = a + a2+a4 and β = a3+ a5 +a6 then the equation whose root are α, β is

• A. x2+x+2=0
• B. x2+x-2=0
• C. x2-x-2=0
• D. x2-x+2=0

Answer 1

Answer: (A)

x2+x+2=0

Answer 2

The correct answer is(A): x2+x+2=0