You didn't need to divide by 0.3. You also divided 6.3 by 0.3 as well as dividing by so in total you divided by . If you want to do this you also have to multiply by to effectively multiply by 1 so that you don't change the value of it, to balance things.
Also there is no need bring everything inside the square root so that it is because you'll end up bringing it all outside the square root in the end.
You can simplify it like this
Somehow your answer still came out right