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(5x²-x+2)(4x²+x-3) =
5x²-x+2
4x²+x-3
------------------------
-15x² + 3x - 6
5x³ - x² + 2x
20x⁴-4x³ + 8x²
-----------------------------------
20x⁴-x³ -8x² +5x - 6
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