(6x^4-x³-28x²+47x-28) × (3x²–5x+4)?
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(6x⁴-x³-28x²+47x-28) × (3x²-5x+4)
=6x⁴(3x²-5x+4)-x³(3x²-5x+4)-28x²(3x²-5x+4)+47x(3x²-5x+4)-28(3x²-5x+4)
=(18x⁶-30x⁵+24x⁴)-3x⁵+5x⁴-4x³-84x⁴+140x³-112x²+141x³-235x²+188x-84x²+140x-112
=18x⁶-33x⁵-55x⁴+277x³-347x²+328x-112
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