The square of 6 (x + y) - 11 (x + y) (X-Y) + 3 (X-Y) =?

The square of 6 (x + y) - 11 (x + y) (X-Y) + 3 (X-Y) =?

Original formula = [2 (x + y) - 3 (X-Y)] [3 (x + y) - (X-Y)]
=(-x+5y)(2x+4y)
=-2(x-5y)(x+2y)