If x = 7 + 2 sqrt10, then what is the va...

If `x = 7 + 2 sqrt10,` then what is the value of `sqrtx - (1)/(sqrtx)` ?

A

`2 sqrt2`

B

`2/3 (2 sqrt5 + sqrt2)`

C

`-2 sqrt2`

D

`2/3(2 sqrt2 + sqrt5)`

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