(1)x^3+3x^2+3x+9=x^2(x+3)+3(x+3)=(x^2+3)(x+3)(2)2x^2+xy-y^2-4x+5y-6=(2x-y)(x+y)-4x+5y-6=(2x-y)(x+y)+(2x+2y)-6x+3y-6=(2x-y)(x+y)+2(x+y)-6x+3y-6=(x+y)(2x-y+2)-3(2x-y+2)=(2x-y+2)(x+y-3)
