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2x³ – 3x 2 + 7x –8 , –5 x³ + 2² x – 4x + 1
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( 2x³ - 3x² + 7x - 8) + (-5x³ + 2²x - 4x +1)
= 2x³ - 3x² + 7x -8 -5x³ + 4x -4x +1
=-3x³ -3x² + 7x -7
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