Another one I need help on...

3

a^(-1/2)  =  1 /a^1/2   = 1 / √a

b^3/2  =   √b^3  = b√b

So..we have

3 ( 1 /√a) ( b√b) =

   3b√b

_______               [ also could be written as 3b √ (b / a)  ]

    √a