Question

3$\sqrt25}+2 \sqrt{4}-5 \sqrt{8}$

Answer 1

$3\sqrt{25}+2\sqrt{4}-5\sqrt{8}\\\\ 3\cdot5+2\cdot2-5\cdot2\sqrt{2}\\\\ 15+4-10\sqrt{2}\\\\ 19-10\sqrt{2}\\\\ \Longrightarrow3\sqrt{25}+2\sqrt{4}-5\sqrt{8}=19-10\sqrt{2}$