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