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7x³+5x²-12x5
B) (5x3 + 8x2 – 5x ) - (x3 + 8x2 – 9x )
4x³+4x=x³+x
C) (8x3 + 2x2 – 5x5 ) . (3x2 – 7x -4 )
24x5+6x4-15x7-56x4-14x3+35x6-32x3-8x2+20x5
-15x7+35x6+44x5-50x4-46x3-8x2
D) (- 5x3 + x2 – 5x ) . (x- 6 + 8x2 )
-5x4+x3-5x2+30-6x2+30x-40x5+8x4-40x3
-40x5+3x4-37x3-11x2+30x+30