x2+1/x2 এর নিম্নোক্ত কোন মানের জন্য x3 + 1/x3 = 0 হবে?

B 2

C 3

D 1

Solution

Correct Answer: Option D

দেওয়া আছে, x3 + (1/x3) = 0
⇒ x3 + (1/x)3 = 0
⇒ {x + (1/x)} {x2 - x.(1/x) + (1/x2)} = 0
⇒ {x + (1/x)} {x2 + (1/x2)-1} = 0
⇒ {x2 + (1/x2)-1} = 0          [যেহেতু, {x + (1/x)} ≠ 0]
⇒ x2 + (1/x2) = 1

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