x2-4x-1 = 0 হলে , x−1/x এর মান কত?

A 4

B 3

C 2

D 1

Solution

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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