x-1/x=7 হলে x3-1/x3 এর মান কত?

A 334

B 154

C 364

D 512

Solution

Correct Answer: Option C

দেওয়া আছে, x-1/x= 7 
∴ x3-1/x= (x-1/x)3 + 3.x.1/x (x-1/x)
=73 + 3.7 
=343+21 = 364

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