Question

sqrt c-sqrt d/sqrt c+sqrt d

Answer 1

\[\sqrt{c }-\sqrt{d}/\sqrt{c}+\sqrt{d}\]

Answer 2

\[((\sqrt{c}-\sqrt{d}) \times (\sqrt{c}-\sqrt{d})) / ((\sqrt{c}+\sqrt{d}) \times (\sqrt{c}-\sqrt{d}))\]

=\[(c -2\sqrt{cd}+d )/ c+d\]

i think

Answer 3

i multiplied by the conjugate