x- 1/x=3 হলে x3-1/x3 এর মান কত?
Solution
Correct Answer: Option D
দেওয়া আছে, x- 1/x= 3
∴ x3- 1/x3 = (x- 1/x)3 + 3.x.1/x (x- 1/x)
=33 + 3.3
=27+9
= 36
∴ x3- 1/x3 = (x- 1/x)3 + 3.x.1/x (x- 1/x)
=33 + 3.3
=27+9
= 36
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