Question

\sqrt{6x} " align="absmiddle" class="latex-formula">

Answer 1

The answer is what the guy below me said

Answer 2

Unfortunately, you haven't shared the instructions.  My guess is that you were supposed to "rationalize the denominator," that is, remove the radical from the denominator.

  10              sqrt(6x)       10sqrt(6x)
------------ * ------------- = ----------------
sqrt(6x)        sqrt(6x)              6x

This is the correct form of the answer; it has no radical in the denominator.