multiply (3 - 5x + 2x2) by (4x - 5)
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(4x−5)(3−5x+2x²)
= 4x(3−5x+2x²)−5(3−5x+2x²)
= 12x−20x²+8x³−15+25x−10x²
= 8x³-30x²+37x-15
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