X = 5 y =- 1。

xy(y*y+y)-y*y(xy+2x)-3xy

=xy(y？ +y)-y？ (xy+2x)-3xy

=xy？ (y+ 1)-xy？ (y+2)-3xy

=xy？ (y+ 1-y-2)-3xy

=﹣xy？ -3xy

=﹣xy(y+3)

Then substitute x = 5 y =- 1.

Original formula =-xy (y+3)

=﹣(﹣ 1)×5(﹣ 1+3)

= 10