Answer
A) $\sqrt 13 - 2$ and $\sqrt 13 + 2$
B) $\sqrt 6 + 3$ and $\sqrt 6 + 3$
C) $\sqrt 5 - \sqrt 10 $ and $\sqrt 5 + \sqrt 10 $
Work Step by Step
Conjugates are the sum and difference of the same two terms
A) $\sqrt 13 - 2$ has the conjugate of $\sqrt 13 + 2$ because the -2 changes to +2 in the conjugate
B) $\sqrt 6 + 3$ has the conjugate of $\sqrt 6 + 3$ because the +3 changes to -3 in the conjugate
C) $\sqrt 5 - \sqrt 10 $ has the conjugate of $\sqrt 5 + \sqrt 10 $ because the $-\sqrt 10$ changes to $+\sqrt 10$ in the conjugate
