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b)(9x+2)(-3x+1)+(-2x-3)(x+1)=-27x²+9x-6x+2-2x²-2x-3x-3=-29x²-2x-1
c) (2x-3)(2x+6) -(x-5)(x+4)=4x²+12x-6x-18-x²-4x+5x+20=3x²+7x+2
d) (3-x)(2+3x) - (2-5x)(3+2x)=6+9x-2x-3x²-6-4x+15x+10x²=7x²+18x