radicals multiply and simplify by factoring

Question

____ ______
^3|y^7* ^3|16y^8

unsure how to do root square sign.

Answer 1

I don't understand your symbols.
If I was going to take the square root of 25x^2y^4, I would write:

sqrt(25x^2y^4) = 5xy^2.

Answer 2

Name correctin.