Ihave an assignment due and number 85 is confusing can someone explain?

expand the numbers inside the root,

solve and bring out what can be taken out as a whole number,

then narrow everything down to one number,

which would then be ur answer

85. 2√48y^5 - 3y √12y³

=> 2√2 x 2 x 2 x 2 x 3  x y x y x y x y x y - 3y√2 x 2 x 3 x y x y x y

=> 2 x 2 x 2 x y x y√3y - 3y x 2y√ 3y

=>8y²√3y - 6y²√3y

=>2y²√3y

19

step-by-step explanation: