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b) -x²+5x+9-(3x-1)=-x²+5x+9-3x+1=-x²+2x+10
c) (3x-1)×(-x²+5x+9)=-3x³+15x²+27x+x²-5x-9=-3x³+16x²+22x-9
d) (3x-1)²+(-x²+5x+9)=(3x)²-2×3x×1+1²-x²+5x+9=9x²-6x+1-x²+5x+9=8x²-x+10