(1)原式=x2-4x+4+2(x2-2x-8)-x2+9=2x2-8x-3,当x=-1时,原式=2×1+8-3=7;(2)原式=x2-3x+2-3x2-9x+2(x2+x-2)=-10x-2,当x= 1 3 时,原式=-10× 1 3 -2=- 16 3 .