If (1)/( x^(2)) + x^(2) represents the ...

If ` (1)/( x^(2)) + x^(2)` represents the redius of circle P and `(1)/( x) + x = 17` which of the following best approximates the circumference of circle P ?

`287 pi`

`547 pi`

`574 pi`

`278 pi`

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