If are the roots of the equation , then the value of is
- A0
- B2
- C8
- D4
Reveal answer
Correct answer
C.8
Reveal solution
The roots satisfy (9th roots of unity, excluding 1). Since , for each. Sum = 8.
If are the roots of the equation , then the value of is
The roots satisfy (9th roots of unity, excluding 1). Since , for each. Sum = 8.