Square root of a +- b sqrt c

1. A.
   $4 + \sqrt{7}$
2. B.
   $4 - \sqrt{7}$
3. C.
   $3 + \sqrt{7}$
4. D.
   $3 - \sqrt{7}$

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1. A.
   $2\sqrt{2} - \sqrt{7}$
2. B.
   $3\sqrt{2} - 2\sqrt{7}$
3. C.
   $\sqrt{15} - \sqrt{7}$
4. D.
   $\sqrt{5} - \sqrt{3}$

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1. A.
   $\sqrt{6}-3\sqrt{2}$
2. B.
   $7-3\sqrt{5}$
3. C.
   $\sqrt{3}-2\sqrt{5}$
4. D.
   $\sqrt{5}-4\sqrt{3}$

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