I learned to convert mixed radicals with variables into an entire radical. I was quiet confused until I later found out that it is  pretty much the same thing as what I learned before. What I did is I took 6 to the power of 2 (using the index as an exponent for 6), which became 36. Then I brought it under the root symbol beside the radicand. Usually I would multiply the 36 and the ‘y’ (radicand) together, though because I do not know the amount of ‘Y’ I left it beside it. In the end I ended up with square root 36y.