15(x-y)- 5x(x-y) -x+y    quick help needed.

   15x-y2 - 5xx-y - x+y=15x-yx-y - 5xx-y - x-y=x-y15x-y-5x-1=x-y15x-15y-5x-1=x-y10x-15y-1

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15(x-y)^2 - 5x(x-y)-xy
=15(x^2 -2xy + y^2) - 5x(x-y)-xy
=15x^2 - 30xy + 15y^2 - 5x^2 + 5xy -xy
=10x^2 + 15y^2 - 26xy
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