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a)3x³-4x²+5x-6+2x³-5x+7 = 5x³-4x²-5x+1
b)3x³-4x²+5x-6-(4x²-3x+2) = 3x³-4x²+5x-6-4x²+3x-2 = 3x³-8x²+8x-8
c)3(3x³-4x²+5x-6)-2(2x³-5x+7) = 9x³-12x²+15x-18-4x³+10x-14 = 5x³-12x²+25x-32