Square root of 2xy times 14x3y?
Do the multiplication, then take the square root. After the
multiplication, you get 28x4y2. The square root of 28 is 2 times
the root of 7, the square root of x4 is x2, and the root of y2 is
y. So, the final result is 2 times square root of 7, times x2y.