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11-48.

13
Did you remember to use the Distributive Property?

$(\sqrt{5})(\sqrt{5})+(\sqrt{5})(\textit{i}\sqrt{3})-(\textit{i}\sqrt{3})(\sqrt{5})-(\textit{i}\sqrt{3})(\textit{i}\sqrt{3})$

The answers for parts (a) and (b) are both whole numbers. How are the factors being multiplied the same or different?