#### Answer

$2 \sqrt{6}$

#### Work Step by Step

Recall, $\sqrt{a}\times \sqrt{b}= \sqrt{a \times b}$. Thus, we can multiply 2 and 12 to obtain the simplified expression:
$\sqrt{2 \times 12}=\sqrt{24}$
In order to simplify a radical, we consider the factors of the number inside of the radical. If any of these factors are perfect squares, meaning that their square root is a whole number, then we can simplify the radical. We know that 4 and 6 are factors of 24. We know that 4 is a perfect square, so we simplify:
$ \sqrt{4} \sqrt{6}=2 \sqrt{6}$