Question

radical 5 times radical 8

Answer 1

Like what is shown in http://openstudy.com/study#/updates/5441e53be4b06e70924f7eca

Since \(\sqrt{m}\sqrt{n} = \sqrt{m\cdot n}\), we have \(\sqrt5\sqrt8=\sqrt{5\cdot 8}=\sqrt{40}\)

\(\sqrt{40} = \sqrt{4\cdot10}=\sqrt4\sqrt{10}=\boxed{2\sqrt{10}}\)

Answer 2

Clearly not 40.

Answer 3

Yes i forgot to factor out