x-1/x = 5 হলে (x+1/x)এর মান কত? 

A 29

B 30

C 31

D 32

Solution

Correct Answer: Option A

দেওয়া আছে, 
x-1/x = 5
∴ (x+1/x)2 = (x+1/x)+4.x.1/x
                 = 52 + 4
                 =25+4
                 = 29

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