x⁴+2x²+1 = 5x² হলে x+(1/x) = কত?
Solution
Correct Answer: Option D
ব্যাখ্যাঃ x⁴+2x²+1 = 5x²
=> x⁴+2x²+1/ x2 = 5
=> x4 / x2 + 2x2 / x2 + 1/x2 = 5
=> x2 + 2+ 1/x2 = 5 => x2 + 1/x2 = 5 - 2
=> (x + 1/x)2 - 2. x. 1/x = 3 => (x + 1/x)2 = 3 + 2
x + 1/x = 5
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