If ( x^(4) + (1)/( x^(4))) = 198 and x...

If ` ( x^(4) + (1)/( x^(4))) = 198 and x gt 0` then what is the value of ` ( x^(2) - (1)/( x^(2)))`

A

14

B

`2sqrt()7`

C

`10sqrt()2`

D

10

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The correct Answer is:

A

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