If \({\left( {{\rm{x}} + \frac{1}{{\rm{x}}}} \right)^2} = 5\) and x > – McqOptions

MCQOPTIONS

1.	If \({\left( {{\rm{x}} + \frac{1}{{\rm{x}}}} \right)^2} = 5\) and x > 0, then what is the value of \({{\rm{x}}^3} + \frac{1}{{{{\rm{x}}^3}}}\) ?
A.	2√5
B.	3√5
C.	4√5
D.	5√5
Answer» B. 3√5

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