x + 1/x = 3 হলে x3 + 1/x3 এর মান কত?

A 18

B 24

C 12

D 16

Solution

Correct Answer: Option A

দেওয়া আছে, x + 1/x = 3
এখন,
x3 + 1/x3
= (x + 1/x)3 - 3 . x . 1/x . (x + 1/x)
= 33 - 3 . 3
= 27 - 3
= 18

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