x + (1/x) = √2 হলে x³ + (1/x³) এর মান কত?
Solution
Correct Answer: Option C
দেওয়া আছে, x+(1/x) =√2
x3+(1/x3) = {x+(1/x)}3-3.x.1/x{x+(1/x)}
= (√2)3-3.√2
= 2√2-3√2
= -√2
x3+(1/x3) = {x+(1/x)}3-3.x.1/x{x+(1/x)}
= (√2)3-3.√2
= 2√2-3√2
= -√2
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