x- 1/x =3 হলে x3 - 1/x3 এর মান কত?
Solution
Correct Answer: Option D
দেওয়া আছে,
x - (1/x) = 3
x - (1/x) = 3
এখন, x³ - (1/x³) = {x - (1/x)}³ + 3.x.(1/x){x + (1/x)}
= (3)³ + 3.3
= 27 + 9
= 36
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