If ( x + (1)/( x)) ^(2) = 5 and x gt 0 ...

If ` ( x + (1)/( x)) ^(2) = 5 and x gt 0` then what is the value of ` ( x^(3) + (1)/( x^(3)))`

A

`2sqrt5`

B

`3sqrt5`

C

`4sqrt5`

D

`5sqrt5`

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The correct Answer is:

A

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