Integral from 9 to 16 lny/sqrt(y)

Here's my work and on the parts bolded I asked for help from someone else but Im not sure WHY he did those steps:

∫ ln(y)⋅y^(−½) dy =

2⋅y^(½)⋅ln(y) − ∫ 2⋅y^(½)⋅(1/y) dy

2⋅y^(½)⋅ln(y) − 2⋅∫ y^(−½) dy

2⋅y^(½)⋅ln(y) − 2⋅(2)⋅y^(½) + C

2⋅y^(½)⋅ln(y) − 4⋅y^(½) + C

2⋅y^(½)⋅[ ln(y) − 2 ] + CIm not sure why and how the 4y

2⋅√(y)⋅[ ln(y) − 2 ] + C

^{1/2 }got eliminated/broken up from the problem. Can anyone explain why these two parts happen? I can handle the rest of the problem from here as you just have to plug in the two intervals and subtract them from each other.

Thanks!