x2-4x-1 = 0 হলে , x−1/x এর মান কত?
A 4
B 3
C 2
D 1
Correct Answer: Option A
x2-4x-1 = 0
=> x - 4 - 1/x = 0 [x দ্বারা উভয়পক্ষকে ভাগ করে ]
=> x - 1/x = 4
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