I am trying to simplify 24a^2/b^4 (the entire expression has a radical sign around it). I got 4a times the radical of 6a/b^4. However, my teacher said this isn't correct on my quiz. Why, and what is the right answer? Thanks!!!

√(24a²/b4)

=√((2a/b²)²*6)
=(2a/b²)*&radic(6)