5a(x-y)^2+10a(y-x)^3

5a(x-y)^2+10a(y-x)^3

5a(x-y)^2+10a(y-x)^3
=5a(x-y)^2[1+2(y-x)]
=5a(x-y)^2(2y-2x+1)