3√2+5√32 – 7√18 – √8

[tex] 3\sqrt{2} + 5 \sqrt{16.2} - 7 \sqrt{9.2} - \sqrt{9.2} \\ 3\sqrt{2} + 20\sqrt{2}- 21\sqrt{2} - 3\sqrt{2} \\ - \sqrt{2} [/tex]

3√2 + 5√32 - 7√18 - √8
= 3√2 + 5√16 . √2 - 7√9 . √2 - √4 . √2
= 3√2 + 20√2 - 21√2 - 2√2
= (3 + 10 - 21 - 2)√2
= -10√2