Question

what is the square root of 8x3

Answer 1

This?
\[\LARGE \sqrt{8*3}\]

Answer 2

If that's it, just take it apart.. 8=4*2
\[\LARGE \sqrt{4*2*3}\]
Since 4 is a perfect square, you can take it out and are left with 2*3. That equals 6, and we can't do anything with that so we just leave it as is:
\[\LARGE 2\sqrt{6}\]