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(2x +3) ²(4+5x²)
b)2x² (2x+1) -3 (2x-1)
(-3x+2x²)(2x+1)(2x-1)
c) -4x²(3x+8) +1 (3x+8)
(3x+8)(1-4x²)
ale nie jestem pewna... zreszta nikt niczego nie moze byc pewny;p