Question

\(\sqrt{2}\left(\sqrt{8}-\sqrt{32}+\sqrt{98}\right)\)

Answer 1

-18

Answer 2

\(\sqrt{2}\left(\sqrt{8}-\sqrt{32}+\sqrt{98}\right)\)

= \(\sqrt{2}\left(\sqrt{4.2}-\sqrt{16.2}+\sqrt{49.2}\right)\)

= \(\sqrt{2}\left(2\sqrt{2}-4\sqrt{2}+7\sqrt{2}\right)\)

= \(\sqrt{2}\left(5\sqrt{2}\right)\)

= \(5.4=20\)

Answer 3

\(\sqrt{2}\left(\sqrt{8}-\sqrt{32}+\sqrt{98}\right)\)

\(=\sqrt{2}\left(2\sqrt{2}-4\sqrt{2}+7\sqrt{2}\right)\)

\(=\sqrt{2}\cdot5\sqrt{2}=10\)