x4 - x2 - 1 = 0 হলে x2 - 1/x2 = কত?
Solution
Correct Answer: Option B
• x4 - x2 - 1 = 0
⇒ (x4/x2) - (x2/x2) -(1/x2) = 0
⇒ x2 - 1/x2 - 1 = 0
⇒ x2 - 1/x2 = 1
⇒ (x4/x2) - (x2/x2) -(1/x2) = 0
⇒ x2 - 1/x2 - 1 = 0
⇒ x2 - 1/x2 = 1
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