x + 1/x = 2 হলে, x³ + 1/x³ = কত ?
Solution
Correct Answer: Option A
দেওয়া আছে, x + 1/x= 2
∴ x3+ 1/x3 = (x + 1/x)3 - 3.x.1/x (x + 1/x)
= 23 - 3.2
= 8 - 6
= 2
∴ x3+ 1/x3 = (x + 1/x)3 - 3.x.1/x (x + 1/x)
= 23 - 3.2
= 8 - 6
= 2
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