x a perfect square of surds: find x^(1/n) + x^(-1/n)

1. A.
   2
2. B.
   3
3. C.
   4
4. D.
   7

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1. A.
   1
2. B.
   2
3. C.
   3
4. D.
   4

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1. A.
   7
2. B.
   6
3. C.
   5
4. D.
   4

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1. A.
   $2\sqrt{2}$
2. B.
   $2\sqrt{3}$
3. C.
   $2\sqrt{5}$
4. D.
   $2\sqrt{6}$

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