If x+y=7x + y = 7x+y=7 and xy=10xy = 10xy=10, find: (x3+y3)2−9x2y2(x+y)2(x^3 + y^3)^2 - 9x^2y^2(x + y)^2(x3+y3)2−9x2y2(x+y)2
