\((\sqrt{18}+\sqrt{8})\sqrt{2}\)

Упростим корни: \(\sqrt{18}=3\sqrt{2}\), \(\sqrt{8}=2\sqrt{2}\).

\((\sqrt{18}+\sqrt{8})\sqrt{2}=(3\sqrt{2}+2\sqrt{2})\sqrt{2}=5\sqrt{2}\cdot\sqrt{2}=5\cdot2=10\).

Ответ: 10.