Answer
16
Work Step by Step
We first combine this into one square root:
$\sqrt {8\times 32} = \sqrt {256}$
In order to see if a radical is in simplified form, see if any of its factors are perfect squares (meaning that their square root will be an integer). We see that 256 is a perfect square, so we know that we can simplify:
$ \sqrt {256}=16$
