x - 1/x = 7 হলে x³ - (1/x)³ এর মান কত?
Solution
Correct Answer: Option B
x³ - (1/x)³
= (x-1/x)³ + 3x.(1/x).(x - 1/x)
= 7³ + 3.1.7
= 343 + 21
= 364
= (x-1/x)³ + 3x.(1/x).(x - 1/x)
= 7³ + 3.1.7
= 343 + 21
= 364
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