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b)(3x³-2x²+5x) (x²-2)-(x³+4x²-1)(x²+5x) = 3x⁵-6x³-2x⁴-4x²-10x-x⁵-5x⁴-4x⁴-20x³+x²+5x=2x⁵-11x⁴-26x³-3x²-5x