Urgent... je n'ai rien compris

Factoriser au maximum chacune des expressions données:
A=(2x-4)(x+3)-(x-2)²
B=9(x-1)²-(x+4)²
C=(x-3)(5x+1)+(x-3)(1-x)+(x-3)(2x-7)
D=9x²-1+(x+2)(3x-1)+(9x²-6x+1)
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