6 square rot 15y^4* 2 square root 20y^2

Answer 1

6 square rot 15y^4* 2 square root 20y^2

= 6√(15y^2) * √(20y^2) ??
If so, then
= 6y√15 * 2y√5
= 12y^2 √75
= 60y^2 √3

Answer 2

6√(15y^4) * √(20y^2)
...
60√3 y^3