Answer
$4\sqrt7$
Work Step by Step
$\sqrt{56\times2}\longrightarrow$ since 16 is a perfect square, factor 8 out of 56
=$\sqrt{7\times8\times2}\longrightarrow$ multiply
=$\sqrt{7\times16}\longrightarrow$ use the multiplication property of square roots
=$\sqrt{7}\times\sqrt{16}\longrightarrow$ simplify
=$4\sqrt7$
