যদি x + 1/x = 3 হয়, তাহলে x3 + 1/x3 = ?

B 18

C 27

D 9

Solution

Correct Answer: Option B

দেওয়া আছে,  x + 1/x = 3

প্রদত্ত রাশি = x3 + 1/x3
= (x + 1/x)3 - 3.x.1/x(x + 1/x)
= 33 - 3 × 3
= 27 - 9
= 18

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