x + 1/x = 6 হলে (x - 1/x)2 এর মান কত?

A 32

B 30

C 34

D 28

Solution

Correct Answer: Option A

দেওয়া আছে,
x + 1/x = 6

∴ (x - 1/x)2 = (x+ 1/x)2 - 4.x.(1/x)
                = 62 - 4
                = 36 - 4
                = 32

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